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Questions and Answers of Statistics

In a study conducted to investigate browsing activity by shoppers, each shopper was initially classified as a non-browser, light browser, or heavy browser. For each shopper, the study obtained a
A major manufacturer of golf equipment is considering three designs for a new driver: Design A, Design B, and Design C. Each design differs slightly in terms of the material used to construct the
A factorial experiment was designed to test for any significant differences in the time needed to perform English to foreign language translations with two computerized language translators. Because
The data from exercise 1 follow.a. Compute the mean square error using equation (14.15).b. Compute the standard error of the estimate using equation (14.16).c. Compute the estimated standard
In exercise 18 the data on price ($) and the overall score for six stereo headphones tested by Consumer Reports were as follows (Consumer Reports website, March 5, 2012).Brand _______________ Price
Given are data for two variables, x and y.a. Develop an estimated regression equation for these data. b. Compute the residuals. c. Develop a plot of the residuals against the independent variable x.
In your own words, explain the difference between an interval estimate of the mean value of y for a given x and an interval estimate for an individual value of y for a given x?
Is the number of square feet of living space a good predictor of a house's selling price? The following data show the square footage and selling price for fifteen houses in Winston Salem, North
In exercise 5, the owner of Showtime Movie Theaters, Inc., used multiple regression analysis to predict gross revenue (y) as a function of television advertising (x1) and newspaper advertising (x2).
In exercise 1, the following estimated regression equation based on 10 observations was presented. = 29.1270 + .5906x1 + .4980x2 Here SST = 6724.125, SSR = 6216.375, sb1 = .0813, and sb2 =
The Ladies Professional Golfers Association (LPGA) maintains statistics on performance and earnings for members of the LPGA Tour. Year-end performance statistics for 134 golfers for 2014 appear in
The personnel director for Electronics Associates developed the following estimated regression equation relating an employee's score on a job satisfaction test to his or her length of service and
Recall that in exercise 49, the admissions officer for Clearwater College developed the following estimated regression equation relating final college GPA to the student's SAT mathematics score and
Recall that in exercise 50 the personnel director for Electronics Associates developed the following estimated regression equation relating an employee's score on a job satisfaction test to length of
PC Magazine provided ratings for several characteristics of computer monitors, including an overall rating (PC Magazine website, April, 2015). The following data show the rating for contrast ratio,
The Ladies Professional Golfers Association (LPGA) maintains statistics on performance and earnings for members of the LPGA Tour. Year-end performance statistics for 134 golfers for 2014 appear in
The Ladies Professional Golfers Association (LPGA) maintains statistics on performance and earnings for members of the LPGA Tour. Year-end performance statistics for 134 golfers for 2014 appear in
A sample containing years to maturity and yield (%) for 40 corporate bonds is contained in the data file named CorporateBonds (Barron's, April 2, 2012). a. Develop a scatter diagram of the data using
The Department of Energy and the U.S. Environmental Protection Agency's 2012 Fuel Economy Guide provides fuel efficiency data for 2012 model year cars and trucks (Department of Energy website, April
Consider the following time series data.a. Construct a time series plot. What type of pattern exists in the data? b. Develop the linear trend equation for this time series. c. What is the forecast
The following table shows Google's annual revenue for 2009 to 2014 (The Wall Street Journal, august 2014). Year Period (t) Revenue ($
Quarterly revenue ($ millions) for twitter for the first quarter of 2012 through the first quarter of 2014 are shown below (adexchange.com, April, 2015): Quarter Revenue ($
The number of users of FACEBOOK from 2004 through 2011 follows (FACEBOOK website, April 16, 2012).a. Construct a time series plot. What type of pattern exists? b. Using Minitab or excel, develop a
Electric power consumption is measured in kilowatt-hours (kWh). the local utility company offers an interrupt program whereby commercial customers that participate receive favorable rates but must
Air pollution control specialists in southern California monitor the amount of ozone, carbon dioxide, and nitrogen dioxide in the air on an hourly basis. the hourly time series data exhibit
The following table reports the percentage of stocks in a portfolio for nine quarters from 2010 to 2012. Quarter Stock
The data contained in the DATAFILE named CRUDECOST shows the U.S. refiner acquisition cost of crude oil in dollars per barrel (energy information administration website, February 3, 2014). a.
Annual retail store revenue for apple from 2007 to 2014 are shown below (source: ifoapple.com).a. Construct a time series plot. What type of pattern exists in the data? b. Using Minitab or excel,
Consider the costello Music company problem in exercise 48. the quarterly sales data follow.a. Use the following dummy variables to develop an estimated regression equation to account for any
Consider the following time series data.a. Construct a time series plot. What type of pattern exists in the data?b. Develop the three-week moving average forecasts for this time series. Compute MSE
Refer to the costello Music company problem in exercise 49. a. Using time series decomposition, compute the seasonal indexes for the four quarters. b. When does costello Music experience the largest
Refer to the hudson Marine problem in exercise 52. Suppose the quarterly sales values for the seven years of historical data are as follows.a. Use the following dummy variables to develop an
Nielsen Media Research identified Empire and the Big Bang theory as the two top-rated prime-time television series. In a local television preference survey, 750 individuals were asked to indicate
Percents of on-time arrivals for flights in the past two years were collected for 11 randomly selected airports. data for these airports follow. Use Î± = .05 to test the hypothesis that there is no
The LPGA ANA Inspiration tournament was held in April 2015 at the Mission Hills Country Club in Rancho Mirage, California. Shown here are first-round and second-round scores for a random sample of 13
Are Southern and Western states equally prone to fatal lightning strikes? The National Weather Service maintains a database that provides information on lightning strike fatalities by state. The
Chicago Midway International Airport and Baltimore/Washington International Thurgood Marshall Airport are the U.S. airports with the worst percentage of delayed flights (Travel+Leisure website, April
The median price of homes in Austin, Texas is $248,640 (Austin Home Search website, April 2015). A sample of 200 homes sold in the south Austin suburb of Westlake Hills found 111 homes with sales
In a recent poll six hundred adults were asked a series of questions about the state of the economy and their children's future. One question was, "do you expect your children to have a better life
An airline operates a call center to handle customer questions and complaints. The airline monitors a sample of calls to help ensure that the service being provided is of high quality. Ten random
Shipments of product from manufacturer to the retailer are tracked by the U.S. Census Bureau. The value of shipments for computer and electronic products for three consecutive years are shown in the
The revenue for Google for the years 2010-2014 is shown in the following table (Wall street Journal, August 2014). Deflate the revenue in dollars based on the CPI (1982-1984 base period). Comment on
Data on quantities of three items sold in Year 1 and Year 5 are given here along with the sales prices of the items in Year 1. Compute a weighted aggregate quantity index for Year 5.
A trucking firm handles four commodities for a particular distributor. Total shipments for the commodities in 2000 and 2015, as well as the 2000 prices, are reported in the following table.Develop a
Many factors influence the retail price of gasoline. The following table shows the average retail price for a gallon of regular grade gasoline for each year from 2011 through 2014 (U.S. Energy
An item with a price relative of 132 cost $10.75 in 2011. Its base year was 1994. a. What was the percentage increase or decrease in cost of the item over the 17-year period? b. What did the item
The closing prices of Yahoo stock, adjusted for splits and dividends, for the final trading days of December 2010-2014 are given in the following table. The CPI for December of each year is also
A large manufacturer purchases an identical component from three independent suppliers that differ in unit price and quantity supplied. The relevant data for 2012 and 2014 are given here. Unit Price
Utilize the concepts of sample and population to describe how a presidential election is unlike an "exit" poll of the electorate.
AVX Stereo Equipment, Inc., recently began a "no-hassles" return policy. A sample of 500 customers who recently returned items showed 400 thought the policy was fair, 32 thought it took too long to
The following table reports the number of cars and light duty trucks sold by the eight largest automakers in the first two months of 2010 compared to the first two months of 2009.a. Compare the total
The following chart shows the hourly wages of a sample of certified welders in the Atlanta, Georgia, area.a. How many welders were studied? b. What is the class interval? c. About how many welders
The following chart shows the selling price ($000) of houses sold in the Billings, Montana, area.a. How many homes were studied? b. What is the class interval? c. One hundred homes sold for less than
Following is the number of shareholders for a selected group of large companies (in thousands):The shareholder numbers are to be organized into a frequency distribution and several graphs drawn to
In 2009, Canada exported $224.9 billion worth of products to the United States. The five largest were: Product Amount Mineral fuel and oil..................$63.9
Farming has changed from the early 1900s. In the early 20th century, machinery gradually replaced animal power. For example, in 1910, U.S. farms used 24.2 million horses and mules and only about
Refer to the 2010 Baseball data that reports information on the 30 Major League Baseball teams for the 2010 season. Create a frequency distribution for the team payroll variable and answer the
A set of data consists of 38 observations. How many classes would you recommend for the frequency distribution?
Sally Reynolds sells real estate along the coastal area of Northern California. Below is the total amount of her commissions earned since 2000. Find the mean, median, and mode of the commissions she
Big Orange Trucking is designing an information system for use in "in-cab" communications. It must summarize data from eight sites throughout a region to describe typical conditions. Compute an
Refer to the Baseball 2010 data, which reports information on the 30 Major League Baseball teams for the 2010 season. Prepare a report on the variable team payroll that specifically addresses each of
A sample of 28 timeshares in the Orlando, Florida, area revealed the following daily charges for a one-bedroom suite. For convenience, the data are ordered from smallest to largest. Construct a box
Listed below are the salaries in $000 of the 25 players on the opening day roster of the 2010 New York Yankees Major League Baseball team.a. Determine the mean, median, and the standard deviation. b.
Develop a scatter diagram for the following sample data. How would you describe the relationship between the values? X-Value Y-Value X-Value
An auto insurance company reported the following information regarding the age of a driver and the number of accidents reported last year. Develop a scatter diagram for the data and write a brief
Refer to the Baseball 2010 data that reports information on the 30 Major League Baseball teams for the 2010 season. a. In the data set, the variable Built is the year that a stadium was constructed.
In a study of the gasoline mileage of model year 2011 automobiles, the mean miles per gallon was 27.5 and the median was 26.8. The smallest value in the study was 12.70 miles per gallon, and the
A survey of grocery stores in the Southeast revealed 40% had a pharmacy, 50% had a floral shop, and 70% had a deli. Suppose 10% of the stores have all three departments, 30% have both a pharmacy and
David Akers is the field goal kicker for the Philadelphia Eagles of the National Football League. During the 2010 season, he attempted 38 field goals and made 32 of the attempts. A summary of his
A recent survey reported in Business Week dealt with the salaries of CEOs at large corporations and whether company shareholders made money or lost money.If a company is randomly selected from the
Refer to the Baseball 2010 data, which reports information on the 30 Major League Baseball teams for the 2010 season. Set up three variables: • Divide the teams into two groups, those that had a
The United States Postal Service reports 95% of first-class mail within the same city are delivered within two days of the time of mailing. Six letters are randomly sent to different locations. a.
Refer to the Baseball 2010 data. Compute the mean number of home runs per game. To do this, first find the mean number of home runs per team for 2010. Next, divide this value by 162 (a season
The Kamp family has twins, Rob and Rachel. Both Rob and Rachel graduated from college two years ago, and each is now earning $50,000 per year. Rachel works in the retail industry, where the mean
A recent article in The Cincinnati Enquirer reported that the mean labor cost to repair a heat pump is $90 with a standard deviation of $22. Monte's Plumbing and Heating Service completed repairs on
Refer to the Buena School District bus data. a. Refer to the maintenance cost variable. The mean maintenance cost for last year is $450.29, with a standard deviation of 53.69. Estimate the number of
The following is a list of Marco's Pizza stores in Lucas County. Also noted is whether the store is corporate-owned (C) or manager-owned (M). A sample of four locations is to be selected and
In a certain section of Southern California, the distribution of monthly rent for a onebedroom apartment has a mean of $2,200 and a standard deviation of $250. The distribution of the monthly rent
The retail stores located in the North Towne Square Mall are:a. If the following random numbers are selected, which retail stores should be contacted for a survey? 11, 65, 86, 62, 06, 10, 12, 77, and
The following is a list of hospitals in the Cincinnati (Ohio) and Northern Kentucky Region. Also included is whether the hospital is a general medical/surgical hospital (M/S) or a specialty hospital
Medical Mutual Insurance is investigating the cost of a routine office visit to family-practice physicians in the Rochester, New York, area. The following is a list of family-practice physicians in
Recent studies indicate that the typical 50-year-old woman spends $350 per year for personal- care products. The distribution of the amounts spent follows a normal distribution with a standard
The mean age at which men in the United States marry for the first time follows the normal distribution with a mean of 24.8 years. The standard deviation of the distribution is 2.5 years. For a
The mean score on a physical fitness test for Division I student-athletes is 947 with a standard deviation of 205. If you select a random sample of 60 of these students, what is the probability the
Following is a list of the 50 states with the numbers 0 through 49 assigned to them.a. You wish to select a sample of eight from this list. The selected random numbers are 45, 15, 81, 09, 39, 43, 90,
Over the past decade, the mean number of members of the Information Systems Security Association who have experienced a denial-of-service attack each year is 510, with a standard deviation of 14.28
Refer to the Baseball 2010 data, which report information on the 30 Major League Baseball teams for the 2010 season. Over the last decade, the mean attendance per team followed a normal distribution
Refer to the Buena School District bus data. Information provided by manufacturers of school buses suggests the mean maintenance cost per month is $455 per bus. Use statistical software to find the
Schadek Silkscreen Printing Inc. purchases plastic cups on which to print logos for sporting events, proms, birthdays, and other special occasions. Zack Schadek, the owner, received a large shipment
Suppose the U.S. president wants an estimate of the proportion of the population who support his current policy toward revisions in the health care system. The president wants the estimate to be
Past surveys reveal that 30% of tourists going to Las Vegas to gamble spend more than $1,000. The Visitor's Bureau of Las Vegas wants to update this percentage. a. The new study is to use the 90%
A sample of 250 observations is selected from a normal population for which the population standard deviation is known to be 25. The sample mean is 20. a. Determine the standard error of the mean. b.
Marty Rowatti recently assumed the position of director of the YMCA of South Jersey. He would like some current data on how long current members of the YMCA have been members. To investigate, suppose
The National Collegiate Athletic Association (NCAA) reported that the mean number of hours spent per week on coaching and recruiting by college football assistant coaches during the season was 70. A
A research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes during a week. They found the distribution of amounts spent per week followed the normal
Refer to the previous exercise. Suppose that 64 smokers (instead of 49) were sampled. Assume the sample mean remained the same. a. What is the 95% confidence interval estimate of µ? b. Explain why
Refer to the Baseball 2010 data, which report information on the 30 Major League Baseball teams for the 2010 season. a. Develop a 95% confidence interval for the mean number of home runs per team. b.
According to the Coffee Research Organization (www.coffeeresearch.org) the typical American coffee drinker consumes an average of 3.1 cups per day. A sample of 12 senior citizens revealed they
After a losing season, there is a great uproar to fire the head football coach. In a random sample of 200 college alumni, 80 favor keeping the coach. Test at the .05 level of significance whether the
Refer to the Baseball 2010 data, which report information on the 30 Major League Baseball teams for the 2010 season.a. Conduct a test of hypothesis to determine whether the mean payroll of the teams

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