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
business
statistics informed decisions using data

Questions and Answers of Statistics Informed Decisions Using Data

29. Blood Pressure Levels When 14 different second-year medical students at Bellevue Hospital measured the blood pressure of the same person, they obtained the results listed below. Assuming that the
28. Cotinine Levels of Smokers When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A sample of 40 smokers has a mean cotinine level of 172.5. Assuming that is
27. Perception of Time Randomly selected statistics students of the author participated in an experiment to test their ability to determine when 1 min (or 60 seconds) has passed. Forty students
26. Ages of Motorcyclists Killed in Crashes A study of the ages of motorcyclists killed in crashes involves the random selection of 150 drivers with a mean of 37.1 years (based on data from the
25. Length of Time to Earn Bachelor’s Degree In a study of the length of time that students require to earn bachelor’s degrees, 80 students are randomly selected and they are found to have a mean
24. Write a statement that interprets the 95% confidence interval.
23. Express the confidence interval in the format of
22. Express the confidence interval in the format of
21. Identify the value of the point estimate of the population mean
54. Poll Accuracy A New York Times article about poll results states, “In theory, in 19 cases out of 20, the results from such a poll should differ by no more than one percentage point in either
53. Rule of Three Suppose n trials of a binomial experiment result in no successes.According to the Rule of Three, we have 95% confidence that the true population proportion has an upper bound of
52. Interpreting Confidence Interval Limits Assume that a coin is modified so that it favors heads, and 100 tosses result in 95 heads. Find the 99% confidence interval estimate of the proportion of
51. Confidence Interval from Small Sample Special tables are available for finding confidence intervals for proportions involving small numbers of cases, where the normal distribution approximation
50. One-Sided Confidence Interval A one-sided confidence interval for p can be expressed as or where the margin of error E is modified by replacing with If Air America wants to report an on-time
49. Using Finite Population Correction Factor This section presented Formulas 7-2 and 7-3, which are used for determining sample size. In both cases we assumed that the population is infinite or very
48. Accuracy of Forecast Temperatures Refer to Data Set 8 in Appendix B. Construct a 95% confidence interval estimate of the proportion of days with an actual high temperature that is more than 2°
47. Precipitation in Boston Refer to Data Set 10 in Appendix B, and consider days with precipitation values different from 0 to be days with precipitation. Construct a 95%confidence interval estimate
46. Alcohol and Tobacco Use in Children’s Movies Refer to Data Set 5 in Appendix B.a. Construct a 95% confidence interval estimate of the percentage of animated children’s movies showing any
45. Blue M&M Candies Refer to Data Set 13 in Appendix B and find the sample proportion of M&Ms that are blue. Use that result to construct a 95% confidence interval estimate of the population
44. Sunroof and Side Air Bags Toyota provides an option of a sunroof and side air bag package for its Corolla model. This package costs $1400 ($1159 invoice price). Assume that prior to offering this
43. Nitrogen in Tires A recent campaign was designed to convince car owners that they should fill their tires with nitrogen instead of air. At a cost of about $5 per tire, nitrogen supposedly has the
42. Sample Size for Downloaded Songs The music industry must adjust to the growing practice of consumers downloading songs instead of buying CDs. It therefore becomes important to estimate the
41. Sample Size for Internet Purchases Many states are carefully considering steps that would help them collect sales taxes on items purchased through the Internet. How many randomly selected sales
40. Internet Shopping In a Gallup poll, 1025 randomly selected adults were surveyed and 29% of them said that they used the Internet for shopping at least a few times a year.a. Find the point
39. Telephone Households In 1920 only 35% of U.S. households had telephones, but that rate is now much higher. A recent survey of 4276 randomly selected households showed that 94% of them had
38. Detecting Fraud When working for the Brooklyn District Attorney, investigator Robert Burton analyzed the leading digits of amounts on checks from companies that were suspected of fraud. Among 784
37. Bias in Jury Selection In the case of Casteneda v. Partida, it was found that during a period of 11 years in Hidalgo County, Texas, 870 people were selected for grand jury duty, and 39% of them
36. Cloning Survey A recent Gallup poll consisted of 1012 randomly selected adults who were asked whether “cloning of humans should or should not be allowed.”Results showed that 901 of those
35. Cell Phones and Cancer A study of 420,095 Danish cell phone users found that 135 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such
34. Misleading Survey Responses In a survey of 1002 people, 701 said that they voted in a recent presidential election (based on data from ICR Research Group). Voting records show that 61% of
33. Mendelian Genetics When Mendel conducted his famous genetics experiments with peas, one sample of offspring consisted of 428 green peas and 152 yellow peas.a. Find a 95% confidence interval
32. Medical Malpractice An important issue facing Americans is the large number of medical malpractice lawsuits and the expenses that they generate. In a study of 1228 randomly selected medical
31. Postponing Death An interesting and popular hypothesis is that individuals can temporarily postpone their death to survive a major holiday or important event such as a birthday. In a study of
30. Gender Selection The Genetics and IVF Institute conducted a clinical trial of the YSORT method designed to increase the probability of conceiving a boy. As this book was being written, 51 babies
4. Sampling A student surveys 100 classmates by asking each if they have outstanding loans. After finding the sample proportion for this sample of n 5 100 subjects, can the methods of this section be
3. Confidence Interval When surveying 500 people, we get 200 yes responses to a particular question, so the proportion of yes responses from the whole population is estimated to be 0.4. Given that we
2. Margin of Error What is a margin of error?
1. Critical Value What is a critical value for a normal distribution?
Problem we noted that touch therapists participated in 280 trials of their ability to sense a human energy field. In each trial, a touch therapist was asked to identify which hand was just below the
2. Left-Handedness According to data from the American Medical Association, 10% of us are left-handed.a. If three people are randomly selected, find the probability that they are all lefthanded.b. If
1. Carbohydrates in Food Some standard food items are randomly selected and the carbohydrate contents (in grams) are measured with the results listed below (based on data from the U.S. Department of
6. Testing for Normality Listed below are the lengths of time (in days) that the New York State budget has been late for each of 19 consecutive and recent years. Do those lengths of time appear to
5. Gender Discrimination When several women are not hired at the Telektronics Company, they do some research and find that among the many people who applied, 30% were women. However, the 20 people
4. Detecting Gender Bias in a Test Question When analyzing one particular question on an IQ test, it is found that among the 20 people who answered incorrectly, 18 are women. Given that the test was
3. High Cholesterol Levels The serum cholesterol levels in men aged 18–24 are normally distributed with a mean of 178.1 and a standard deviation of 40.7. Units are in mg 100 mL, and the data are
2. Boston Beanstalk Club The Boston Beanstalk Club has a minimum height requirement of 74 in. for men. Heights of men are normally distributed with a mean of 69.0 in.and a standard deviation of 2.8
1. Weighing Errors A scale is designed so that when items are weighed, the errors in the indicated weights are normally distributed with a mean of 0 g and a standard deviation of 1 g. (If the scale
4. Central Limit Theorem What does the central limit theorem tell us?
3. Simple Random Sample A researcher has collected a large sample of IQ scores from friends and relatives. He claims that because his sample is large and the distribution of his sample scores is very
2. Distribution of Sample Means A process consists of randomly selecting 250 adults, measuring the grip strength (right hand only), then finding the sample mean. Assuming that this process is
1. Normal Distribution What is a normal distribution? What is a standard normal distribution?
37. Normal Approximation Required This section included the statement that “In reality, almost all practical applications of the binomial probability distribution can now be handled well with
36. Overbooking Flights Vertigo Airlines works only with advance reservations and experiences a 7% rate of no-shows. How many reservations could be accepted for an airliner with a capacity of 250 if
35. Joltin’ Joe Assume that a baseball player hits .350, so his probability of a hit is 0.350.(Ignore the complications caused by walks.) Also assume that his hitting attempts are independent of
34. Replacement of TVs Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 year (based on data from “Getting Things Fixed,” Consumer
33. Winning at Roulette Marc Taylor plans to place 200 bets of $1 each on the number 7 at roulette. A win pays off with odds of 35:1 and, on any one spin, there is a probability of 1 38 that 7 will
32. Detecting Fraud When working for the Brooklyn District Attorney, investigator Robert Burton analyzed the leading digits of amounts on checks from companies that were suspected of fraud. Among 784
31. Detecting Credit Card Fraud The Dynamic Credit company issues credit cards and uses software to detect fraud. After tracking the spending habits of one consumer, it is found that charges over
30. Bias in Jury Selection In Orange County, 12% of those eligible for jury duty are lefthanded.Among 250 people selected for jury duty, 25 (or 10%) are lefties. Find the probability of getting at
29. Cloning Survey A recent Gallup poll consisted of 1012 randomly selected adults who were asked whether “cloning of humans should or should not be allowed.” Results showed that 89% of those
28. Acceptance Sampling Some companies monitor quality by using a method of acceptance sampling, whereby an entire batch of items is rejected if a random sample of a 6-6 Normal as Approximation to
27. Blood Group Forty-five percent of us have Group O blood, according to data provided by the Greater New York Blood Program. Providence Memorial Hospital is conducting a blood drive because its
26. M&M Candies: Are 20% Orange? According to Mars (the candy company, not the planet), 20% of M&M plain candies are orange. Data Set 13 in Appendix B shows that among 100 M&Ms chosen, 25 are orange.
25. Identifying Gender Discrimination After being rejected for employment, Kim Kelly learns that the Bellevue Advertising Company has hired only 21 women among its last 62 new employees. She also
24. Overbooking Flights Air America is considering a new policy of booking as many as 400 persons on an airplane that can seat only 350. (Past studies have revealed that only 85% of the booked
23. Cell Phones and Brain Cancer In a study of 420,095 cell phone users in Denmark, it was found that 135 developed cancer of the brain or nervous system. Assuming that cell phones have no effect,
22. Cholesterol Reducing Drug The probability of flu symptoms for a person not receiving any treatment is 0.019. In a clinical trial of Lipitor, a common drug used to lower cholesterol, 863 patients
21. Mendel’s Hybridization Experiment When Mendel conducted his famous hybridization experiments, he used peas with green pods and yellow pods. One experiment involved crossing peas in such a way
20. TV Advertising Charges for advertising on a TV show are based on the number of viewers, which is measured by the rating. The rating is a percentage of the population of 110 million TV households.
19. Voters Lying? In a survey of 1002 people, 701 said that they voted in a recent presidential election (based on data from ICR Research Group). Voting records show that 61% of eligible voters
18. Probability of at Least 42 Girls Assuming that boys and girls are equally likely, estimate the probability of getting at least 42 girls in 64 births. Is it unusual to get at least 42 girls in 64
17. Probability of More Than 36 Girls Assuming that boys and girls are equally likely, estimate the probability of getting more than 36 girls in 64 births. Is it unusual to get more than 36 girls in
4. Interpreting Binomial Probability In a test of a method of gender selection, 80 couples are given a treatment designed to increase the likelihood that a baby will be a girl. There were 47 girls
3. Distribution of Sample Proportions The Newport Bottling plant produces bottles of cola that are packaged in six-packs. The probability of a defective bottle is 0.001. Can we approximate the
1. Distribution of Sample Proportions Consider a study in which we obtain records from the next 50 babies that are born, then compute the proportion of girls in this sample. Assume that this study is
3. SAT Math Scores of Women The math SAT scores for women are normally distributed with a mean of 496 and a standard deviation of 108.a. If a woman who takes the math portion of the SAT is randomly
2. Normal Quantile Plot Refer to the data listed in Exercise 1 and construct a normal quantile plot. Based on the result, do the heights appear to come from a population that is normally distributed?
1. Heights of Presidents Listed below are the heights (in inches) of the Presidents who served in the 20th century. Assume that these values are sample data from some larger population.67 70 72 71 72
12. Nicotine in Cigarettes The Carolina Tobacco Company advertised that its best-selling nonfiltered cigarettes contain at most 40 mg of nicotine, but Consumer Advocate magazine ran tests of 10
11. Umpire Strike Rate In a recent year, some professional baseball players complained that umpires were calling more strikes than the average rate of 61.0% called the previous year. At one point in
10. Heights of Women Anthropometric survey data are used to publish values that can be used in designing products that are suitable for use by adults. According to Gordon, Churchill, et al., women
9. Body Temperature Apremed student in a statistics class is required to do a class project.Intrigued by the body temperatures in Data Set 2 of Appendix B, she plans to collect her own sample data to
8. Random Generation of Data The TI-83 84 Plus calculator can be used to generate random data from a normally distributed population. The command randNorm(100,15,50)generates 50 values from a
7. IQ Scores For a simple random sample of adults, IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Asimple random sample of 13 statistics professors yields a
6. Testing Lipitor for Adverse Effects In clinical tests of the drug Lipitor (generic name, atorvastatin), 863 patients were treated with 10-mg doses of atorvastatin, and 19 of those patients
5. Are Consumers Being Cheated? The Orange County Bureau of Weights and Measures received complaints that the Windsor Bottling Company was cheating consumers by putting less than 12 oz of root beer
4. Weights of Sugar Packets A student of the author randomly selected 70 packets of sugar and weighed the contents of each packet, getting a mean of 3.586 g and a standard deviation of 0.074 g. Test
3. Glamour Magazine Survey Glamour magazine sponsored a survey of 2500 prospective brides and found that 60% of them spent less than $750 on their wedding gown.Use a 0.01 significance level to test
2. Interviewing Mistakes An Accountemps survey of 150 executives showed that 44%of them say that “little or no knowledge of the company” is the most common mistake made by candidates during job
1. Identifying Hypotheses, Distributions, and Verifying Requirements Based on the given conditions, identify the alternative hypothesis. Also, either identify the sampling distribution(normal, t,
2. Sample You have just collected a very large (n 5 2575) sample of responses obtained from adult Americans who mailed responses to a questionnaire printed in Fortune magazine. If this sample is used
1. Practical Significance When testing the claim that the mean amount lost on a diet is greater than 0 lb, we use sample results showing that 10,000 people lost amounts with a mean of 0.1 lb. Also,
20. Appendix B Data for Precipitation Amounts Refer to Data Set 8 in Appendix B and use the sample data consisting of the precipitation amounts. Test the claim that these amounts are from a
19. Appendix B Data for Weights of Quarters Refer to Data Set 14 in Appendix B and use the sample data consisting of weights of quarters made after 1964. Test the claim that these quarters come from
17. Monitoring Lead in Air Listed below are measured amounts of lead (in micrograms per cubic meter, or in the air. The Environmental Protection Agency has established an air quality standard for
16. Supermodel Heights Use a 0.05 significance level to test the claim that heights of female supermodels vary less than the heights of women in general. The standard deviation of heights of the
14. World’s Smallest Mammal The world’s smallest mammal is the bumblebee bat, also known as the Kitti’s hog-nosed bat (or Craseonycteris thonglongyai). Such bats are roughly the size of a large
13. Credit Rating When consumers apply for credit, their credit is rated using FICO(Fair, Isaac, and Company) scores. Credit ratings are given below for a sample of applicants for car loans, and
12. Manufacturing Aircraft Altimeters The Stewart Aviation Products Company uses a new production method to manufacture aircraft altimeters. A simple random sample of 81 altimeters is tested in a
11. Variation in Peanut M&Ms Use a 0.01 significance level to test the claim that peanut M&M candies have weights that vary more than the weights of plain M&M candies.The standard deviation for the

Showing 800 - 900 of 5564

First
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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