All Matches

Solution Library

Expert Answer

Textbooks

Search Textbook questions, tutors and Books

Oops, something went wrong!

Change your search query and then try again

Result Not Found

Books FREE
Tutors
Study Help
Hire a Tutor
AI Study Help New

Search
Sign In
Register

study help
mathematics
statistics

Questions and Answers of Statistics

A study was conducted to examine differences in starting salaries for university graduates in Ontario and Quebec. Because starting salaries are in different ranges based on type of degree, the
In Exercises 1, use a 0.05 significance level to test the claim that the two samples come from populations with the same mean. In each case, the two samples are independent and have been randomly
A fish-processing company is concerned about the shelf life of its new cat food. A sample examined in Halifax, Nova Scotia (n = 35) had an acceptable mean shelf life of 13 months, with a standard
Data Set 9 in Appendix B contains measured levels of serum cotinine (in ng/mL) for two samples of nonsmokers: nonsmokers with no environmental tobacco smoke exposure at home or at work, and
Data Set 11 in Appendix B contains weights of 100 randomly selected M&cM plain candies. Those weights have a mean of 0.9147 g and a standard deviation of 0.0369 g. A previous edition of this book
Two samples are used to compare building permit values for larger communities versus smaller ones in the regional municipality of Durham, in Ontario. For both samples n is 38. Expressed in thousands
As an aid to farmers, the Alberta government records freezing dates for over a hundred locations around the province. Based on average last-frost dates for spring, a researcher has proposed dividing
Refer to the pulse rates in Data Set 8 from Appendix B. First identify and delete the two outliers that .are unrealistic pulse rates for living and reasonably healthy statistics students. a. Use a
When testing for a difference between the means of a treatment group and a group given a placebo, the following Excel display is obtained. Using a 0.05 significance level, is there sufficient
When testing for a difference between the means of a treatment group and a group given a placebo, the following Excel display is obtained. Using a 0.02 significance level, is there sufficient
Refer to Exercise 5. If the actual difference between the population means is 1.5, find Î², the probability of a type II error. (See Section 7-2.) Hint: In Step 1, replace x- by (x-1 -
The examples in this section used the axial loads of a sample of cans 0.0109 in. thick and a second sample of cans 0.0111 in. thick. (The original data are listed in Data Set 15 of Appendix B.) We
In Exercises 2, use a 0.05 significance level to test the claim that the two samples come from populations with the same mean. In each case, the two samples are independent and have been randomly
The examples in this section used the axial loads of cans, where the loads were given in pounds. How are the box plots, hypothesis test, and confidence interval affected if the loads are all
a. Find the variance for this population of x scores: 5,10, 15. (See Section 2-5 for the variance σ2 of a population.) b. Find the variance for this population of y scores: 1, 2, 3. c. List the
Using the sample data given in Exercise 1, construct a 95% confidence interval estimate of the difference between the two population means. Do the confidence interval limits contain 0? What do you
Using the sample data given in Exercise 2, construct a 95% confidence interval estimate of the difference between the two population means. Do the confidence interval limits contain 0? What do you
For comparison purposes, mutual funds are often grouped into various categories. Do Canadian equity funds and Canadian balanced equity funds differ with respect to percentage of foreign holdings
Provincial governments across Canada have been re-examining their delivery of services, such as health care. A researcher compared the number of beds in long-term care centres in New Brunswick and in
The Medassist Pharmaceutical Company wants to test Dozenol, a new cold medicine intended for night use. Tests for such products often include a "treatment group" of people who use the drug and a
A group of college students randomly selected 217 student cars and found that they had ages with a mean of 7.89 years and a standard deviation of 3.67 years. They also randomly selected 152 faculty
In April 1996, The Globe and Mail listed the salaries of the hundreds of University of Toronto staff who earn at least $100,000 annually. On studying this article, several disgruntled staff (whose
In Exercises 1, test the given claim. Use a significance level of a = 0.05, and assume that all populations are normally distributed. Use the traditional method of testing hypotheses outlined, and
Provincial governments across Canada have had to re-examine their delivery of services, such as health care, to avoid expensive duplication, and yet provide fair access to their citizens. The
Sample data were collected to compare the ages of CEOs of top growth companies in western Canada and Quebec. Because of small sample sizes, techniques introduced later in this chapter would be needed
Refer to Data Set 11 in Appendix B and use a 0.10 level of significance to test the claim that red and yellow M&M plain candies have weights with different standard deviations. If you were
A hypothesis test of the claim a\ = cr1 is being conducted with a 0.05 level of significance. What do you conclude in each of the following cases? a. Test statistic is F = 2.0933; n1 = 50; n2 = 35 b.
To test a claim about two population variances by using the P-value approach, first find the F test statistic, then refer to Table A-5 to determine how it compares to the critical values listed for
For hypothesis tests in this section that were two-tailed, we found only the upper critical value. (Recall that for two-tailed tests, the significance level that you look up in the F distribution
In addition to testing claims involving Ïƒ12 and Ïƒ22, we can also construct interval estimates of the ratio Ïƒ12/Ïƒ22 using the following expression:Here FL
Sample data consist of temperatures recorded for two different groups of items that were produced by two different production techniques. A quality control specialist plans to analyze the results.
In Exercises 2, test the given claim. Use a significance level of a = 0.05, and assume that all populations are normally distributed. Use the traditional method of testing hypotheses outlined, and
An experiment was conducted to investigate the effect of stress on the recall ability of police eyewitnesses. The experiment involved a non stressful interrogation cooperative suspect and a stressful
Customer waiting times are studied at the Humber Valley Credit Union. When 25 randomly selected customers enter any one of several waiting lines, their times have a mean of 6.896 min and a standard
A study was done of 137 young adult males who had been treated for substance abuse. The study compared their yearly rates of traffic accidents before treatment and after treatment. For the
Canadian equity funds and Canadian balanced equity funds can be compared for their percentages of foreign holdings. At the 0.05 significance level, test the claim that both types of funds have the
A fish-processing company is concerned about the shelf life of its new cat food. A sample examined in Halifax (n = 35) had an acceptable mean shelf life of 13 months, with a standard deviation of
An investor is comparing the variability of estimates by stock analysts, when they analyze the earnings potentials of U.S. and Canadian firms. For a sample of estimates (by different analysts) of the
Because of wind patterns, Air Canada flights between Vancouver and San Francisco can take different times in each direction. Sample times for flights between these cities, from March 8 to March 18,
In Exercises 1, test the given claim. Use a significance level of Î± = 0.05, and assume that all populations are normally distributed. Use the traditional method of testing hypotheses
A simple random sample of 21 peanut M&M candies is selected, and each candy is weighed. The mean is 2.4658 g and the standard deviation is 0.3127 g. The 100 g MScM plain candies listed in Data Set 11
Data Set 11 in Appendix B includes a sample of 21 red M&Ms with weights having a mean of 0.9097 g and a standard deviation of 0.0275 g. The data set also includes a sample of 8 orange M&Ms with
Refer to Data Set 11 in Appendix B and test the claim that yellow M&Ms and green M&Ms have the same mean weight. If you were part of a quality control team with responsibility for ensuring
Refer to Data Set 4 in Appendix B. If the Ontario-Manitoba border is taken as the boundary between East and West, test the claim that in comparing provincial averages, there is no difference in mean
Provincial governments have been re-examining their delivery of services, such as health care. The accompanying table is based on one random sample of hospitals in New Brunswick and another in Nova
Sample data were collected to compare the ages of CEOs of top growth companies in western Canada and Quebec, shown in the table below. Exercise 11 in Section 8 - 4 looked at the variances for these
An experiment was conducted to test the effects of alcohol. The errors were recorded in a test of visual and motor skills for a treatment group of people who drank ethanol and another group given a
An experiment was conducted to test the effects of alcohol. The breath alcohol levels were measured for a treatment group of people who drank ethanol and another group given a placebo. The results
Assume that two samples have the same standard deviation and that both are independent, small, and randomly selected from normally distributed populations. Also assume that we want to test the claim
Refer to the two examples of this section that used the number of employees in key industry groups. How are the hypothesis test and confidence interval affected if the number of degrees of freedom is
In Exercises 2, test the given claim. Use a significance level of a = 0.05, and assume that all populations are normally distributed. Use the traditional method of testing hypotheses outlined in
Suppose that the sample data for the ages of CEOs displayed for Exercise 15 had omitted one data point because it was viewed as an outlier. This extra data value was an 11th CEO from Quebec, who is
Using the sample data in Exercise 1, construct a 95% confidence interval estimate of the difference between the means of the two populations.
Using the sample data in Exercise 2, construct a 95% confidence interval estimate of the difference between the means of the two populations.
The equality of Air Canada flight times (in hours) between Vancouver and San Francisco is tested using Excel. A preliminary F test shows that there is no significant difference between the two sample
Employees who work with electronic components at Canadian Automated Electronics are required to undergo special training. Training includes completing tasks under simulated conditions and recording
In a sample of the driving records of 137 young adult males who underwent treatment for substance abuse in a Toronto clinic, the mean accident rate after treatment was 0.068, with a standard
Assume that Data Set 21 in Appendix B represents sample prices and characteristics of high-quality diamonds sold at auction. A vendor claims that near - colorless diamonds sell at a higher price than
Assume that Data Set 21 in Appendix B represents sample prices and characteristics of high quality diamonds sold at auction. A vendor claims that nearly flawless diamonds sell at a higher price than
In Exercises 1, assume that you plan to use a significance level of a - 0.05 to test the claim that p1.= p2. Use the given sample sizes and numbers of successes to find(a) The pooled estimate p-,(b)
During the campaign for the June 1997 federal election, many opinion polls were conducted. Early in the campaign, a poll found that 47.6% of voters supported the Liberals. Then in May 1997 an Angus
Karl Pearson, who developed many important concepts in statistics, collected crime data in 1909. Of those convicted of arson, 50 were drinkers and 43 abstained. Of those convicted of fraud, 63 were
An initial public offering (IPO) of a company's stock is considered "under-priced" if there is a large percentage difference between its issuing price and its closing price after one day of trading.
Professional pollsters are becoming concerned about the growing rate of refusals among potential survey subjects. In analyzing the problem, there is a need to know if the refusal rate is universal or
A mining company conducted a safety analysis for workers at a Saskatchewan site. Of 450 sample records in January, 16 revealed undesirable safety conditions. Of 660 sample records in February/March,
When games were sampled from throughout a season, it was found that the home team won 127 of 198 professional basketball games, and the home team won 57 of 99 professional football games (based on
Ziac is a Lederle Laboratories drug developed to treat hypertension. Lederle Laboratories reported that when 221 people were treated with Ziac, 3.2% of them experienced dizziness. It was also
To test the null hypothesis that the difference between two population proportions is equal to a nonzero constant c, use the test statisticAs long as n1, and n2 are both large, the sampling
Sample data are randomly drawn from three independent populations, each of size 100. The sample proportions are p^1 = 40/100, p^2 = 30/100, and p3 = 20/100.a. At the 0.05 significance level, test H0:
The sample size needed to estimate the difference between two population proportions to within a margin of error E with a confidence level of 1 - a can be found as follows. In the expressionReplace
In Exercises 2, assume that you plan to use a significance level of a - 0.05 to test the claim that p1. = p2. Use the given sample sizes and numbers of successes to find(a) The pooled estimate
The Composting Council of Canada requires that type AA compost must comprise less than 1% foreign matter. A ministry inspector uses random sampling to test two commercial composting facilities
According to the Annual Report of the Correctional Investigator (1995-1996), this agency was able to resolve or provide assistance for 88 of the 280 complaints received about the prison grievance
Based on a random survey of 1000 adult Canadians conducted in January 2001, a headline in The Globe and Mail (February 5, 2001) concluded that "fewer Canadians support free trade." In the survey, 64%
In initial tests of the Salk vaccine, 33 of 200,000 vaccinated children later developed polio. Of 200,000 children vaccinated with a placebo, 115 later developed polio. At the 0.01 level of
A random sample was taken from the Financial Post list of top 500 companies for 1998. Of 26 food- and beverage-related industries in the sample, 12 had at least 10% foreign ownership. Of 29 wholesale
In a study of people who stop to help drivers with disabled cars, researchers hypothesized that more people would stop to help someone if they first saw another driver with a disabled car getting
Data Set 18 in Appendix B shows body temperatures (in degrees Celsius) of adults accepted for voluntary surgical procedures in an urban hospital. Sample data for men are summarized by these
Twelve Dozenol tablets are tested for solubility before and after being stored for one year. The indexes of solubility are given in the table below.a. At the 0.05 significance level, test the claim
In clinical tests of adverse reactions to the drug Viagra, 7% of the 734 subjects in the treatment group experienced dyspepsia (indigestion), but 2% of the 725 subjects in the placebo group
Having just been charged more to fly from Toronto to Saint John than from Toronto to Britain, an annoyed passenger claims there is no difference in price between domestic and international flights.
To conduct the means test in Exercise 4, it was assumed that the two samples had unequal variances. Test whether the evidence supports that assumption, at the 0.02 level of significance.
A test question is considered good if it discriminates between prepared and unprepared students. The first question on a test was answered correctly by 62 of 80 prepared students and by 23 of 50
In a study of techniques used to measure lung volumes, physiological data were collected for 10 subjects. The values given in the accompanying table are in liters, representing the measured forced
A major airline is experimenting with its training program for flight attendants. With the traditional six-week program, a random sample of 60 flight attendants achieves competency test scores with a
Researchers are testing commercial air-filtering systems made by the Winston Industrial Supply Company and the Barrington Filter Company. Random samples are tested for each company, and the filtering
The data in the table to the right were obtained through a survey of randomly selected subjects. a. If one of the survey subjects is randomly selected, find the probability of getting someone
The Newton Scientific Instrument Company manufactures scales with its day shift and night shift. Random samples are routinely tested with errors recorded as positive amounts for readings that are too
Analysis of variance results generated by Excel are given on the next page. The sample results are measured consumer reactions to television commercials for different products. Assume that we want to
The values in the list below are measured maximum breadths of male Egyptian skulls from different epochs (in mm, based on data from Ancient Races of the Thebaid, by Thomson and Randall-Maciver).
A political scientist claims that since Confederation, the number of times the House of Commons sits in each session of Parliament has been increasing. The table shows, in three samples grouped by
The political scientist from Exercise 11 also claims that for Parliaments of 4, 4.5, and 5 years in length, the mean number of times the Senate has sat during a session is equal. The table shows, in
Refer to Data Set 21 in Appendix B. At the 0.05 significance level, test the claim that the mean weight (in carats) of diamonds is the same for each of the four clarity levels (2, 3, 4, or 5) shown.
Refer to Data Set 9 in Appendix B. Use a 0.01 significance level to test the claim that the mean cotinine level is different for these three groups: non-smokers not exposed to environmental tobacco
Repeat Exercise 3 after adding 1°C to each temperature listed in the "Awaiting Surgery" group. Compare these results to those found in Exercise 3.
If Exercise 3 is repeated after changing the temperature readings from the Celsius scale to the Fahrenheit scale, are the results affected? In general, how is the analysis of variance F test
How are analysis of variance results affected in each of the following cases?a. The same constant is added to every sample score.b. Every sample score is multiplied by the same constant.c. The order
Five independent samples of 50 scores each are randomly drawn from popu¬lations that are normally distributed with equal variances. We wish to test the claim that μ1 = μ2 = μ3 = μ4 = μ5 a. If
In this exercise you will verify that when you have two sets of sample data, the t test for independent samples (assuming equal variances) and the ANOVA method of this section are equivalent. Refer
Analysis of variance results generated by Excel are given on the next page. The sample results are measured consumer reactions to television commercials for different products. Assume that we want to

Showing 61700 - 61800 of 88274

First
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
Last

Services

Sitemap
Fun
Definitions
Become Tutor
Study Help Categories
Recent Questions
Expert Questions

Company Info

Security
Copyrights
Privacy Policy
Terms & Conditions
SolutionInn Fee
Scholarship

Get In Touch

About Us
Contact Us
Career
Jobs
FAQ
Campus Ambassador

Secure Payment

Download Our App

© 2024 SolutionInn. All Rights Reserved