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Statistical Techniques In Business And Economics 16th Edition Douglas Lind, William Marchal - Solutions

The third row of a stem-and-leaf chart appears as follows: 21 ƒ 0 1 3 5 7 9. Assume whole number values.a. What is the “possible range” of the values in this row?b. How many data values are in this row?c. List the actual values in this row of data.
Silver Springs Moving and Storage Inc. is studying the relationship between the number of rooms in a move and the number of labor hours required for the move. As part of the analysis, the CFO of Silver Springs developed the following scatter diagram.a. How many moves are in the sample?b. Does it
The Director of Planning for Devine Dining Inc. wishes to study the relationship between the gender of a guest and whether the guest orders dessert. To investigate the relationship, the manager collected the following information on 200 recent customers.a. What is the level of measurement of the
Ski Resorts of Vermont Inc. is considering a merger with Gulf Shores Beach Resorts Inc. of Alabama. The board of directors surveyed 50 stockholders concerning their position on the merger. The results are reported below.a. What level of measurement is used in this table?b. What is this table
A sample of students attending Southeast Florida University is asked the number of social activities in which they participated last week. The chart below was prepared from the sample data.a. What is the name given to this chart?b. How many students were in the study?c. How many students reported
Doctor€™s Care is a walk-in clinic, with locations in Georgetown, Moncks Corner, and Aynor, at which patients may receive treatment for minor injuries, colds, and flu, as well as physical examinations. The following charts report the number of patients treated in each of the three
The following stem-and-leaf chart from the Minitab software shows the number of units produced per day in a factory.a. How many days were studied?b. How many observations are in the first class?c. What are the minimum value and the maximum value?d. List the actual values in the fourth row.e. List
The following stem-and-leaf chart reports the number of movies rented per day at Video Connection on the corner of Fourth and Main Streets.a. How many days were studied?b. How many observations are in the last class?c. What are the maximum and the minimum values in the entire set of data?d. List
Aloha Banking Co. is studying ATM use in suburban Honolulu. A sample of 30 ATMs showed they were used the following number of times yesterday. Develop a stem-and-leaf chart. Summarize the number of times each ATM was used. What were the typical, mini-mum, and maximum number of times each ATM
Determine the median and the first and third quartiles in the followingdata.
Determine the median and the first and third quartiles in the followingdata.
The Thomas Supply Company Inc. is a distributor of gas-powered generators. As with any business, the length of time customers take to pay their invoices is important. Listed below, arranged from smallest to largest, is the time, in days, for a sample of The Thomas Supply Company Inc. invoices.a.
Kevin Horn is the national sales manager for National Textbooks Inc. He has a sales staff of 40 who visit college professors all over the United States. Each Saturday morning he requires his sales staff to send him a report. This report includes, among other things, the number of professors visited
The box plot below shows the amount spent for books and supplies per year by students at four year public colleges.a. Estimate the median amount spent.b. Estimate the first and third quartiles for the amount spent.c. Estimate the interquartile range for the amount spent.d. Beyond what point is a
The box plot shows the undergraduate in-state charge per credit hour at four-year public colleges.a. Estimate the median.b. Estimate the first and third quartiles.c. Determine the interquartile range.d. Beyond what point is a value considered an outlier?e. Identify any outliers and estimate their
The following values are the starting salaries, in $000, for a sample of five accounting graduates who accepted positions in public accounting last year.a. Determine the mean, median, and the standard deviation.b. Determine the coefficient of skewness using Pearsonâ€™s method.c. Determine the
Listed below are the salaries, in $000, for a sample of 15 chief financial officers in the electronics industry.a. Determine the mean, median, and the standard deviation.b. Determine the coefficient of skewness using Pearsonâ€™s method.c. Determine the coefficient of skewness using the
Listed below are the commissions earned ($000) last year by the 15 sales representatives at Furniture Patch Inc.a. Determine the mean, median, and the standard deviation.b. Determine the coefficient of skewness using Pearsonâ€™s method.c. Determine the coefficient of skewness using the
Listed below are the salaries for the 2012 New York Yankees Major League Baseball team.a. Determine the mean, median, and the standard deviation.b. Determine the coefficient of skewness using Pearsonâ€™s method.c. Determine the coefficient of skewness using the softwaremethod.
The screen size for 23 LCD televisions is given below. Make a stem-and-leaf display of thisvariable.
The top 25 companies (by market capitalization) operating in the Washington, DC, area along with the year they were founded and the number of employees are given below. Make a stem and-leaf display of each of these variables and write a short description of yourfindings.
In recent years, due to low interest rates, many homeowners refinanced their home mort-gages. Linda Lahey is a mortgage officer at Down River Federal Savings and Loan. Below is the amount refinanced for 20 loans she processed last week. The data are reported in thousands of dollars and arranged
A study is made by the recording industry in the United States of the number of music CDs owned by 25 senior citizens and 30 young adults. The information is reported below.a. Find the median and the first and third quartiles for the number of CDs owned by senior citizens. Develop a box plot for
The corporate headquarters of Bank.com, a new Internet company that performs all banking transactions via the Internet, is located in downtown Philadelphia. The director of human resources is making a study of the time it takes employees to get to work. The city is planning to offer incentives to
The American Society of PeriAnesthesia Nurses (ASPAN; www.aspan.org) is a national organization serving nurses practicing in ambulatory surgery, preanesthesia, and postanes- thesia care. The organization consists of the 40 components listed below.Use statistical software to answer the following
McGivern Jewelers is located in the Levis Square Mall just south of Toledo, Ohio. Recently it ran an advertisement in the local newspaper reporting the shape, size, price, and cut grade for 33 of its diamonds currently in stock. The information is reported below.a. Develop a box plot of the
Here is a table showing the number of employed and unemployed workers 20 years or older by gender in the United States.a. How many workers were studied?b. What percent of the workers were unemployed?c. Compare the percent unemployed for the men and thewomen.
Refer to the Real Estate data, which reports information on homes sold in the Goodyear, Arizona, area during the last year. Prepare a report on the selling prices of the homes. Be sure to answer the following questions in your report.a. Develop a box plot. Estimate the first and the third
Refer to the Baseball 2012 data that report information on the 30 Major League Baseball teams for the 2012 season.a. In the data set, the variable, built, is the year that a stadium was constructed. Using this variable, create a new variable, age, by subtracting the value of the variable, built,
Refer to the Buena School District bus data.a. Refer to the maintenance cost variable. Develop a box plot. What are the first and third quartiles? Are there any outliers?b. Determine the median maintenance cost. Based on the median, develop a contingency table with bus manufacturer as one variable
A sample of 50 funds deposited in First Federal Savings Bank€™s MCA (miniature checking account) revealed the following amounts.Use a statistical software package such as Excel or Minitab to help answer the following questions.a. Determine the mean, median, and standard deviation.b.
Listed below are the 44 U.S. presidents and their age as they began their terms in office.Use a statistical software package such as Excel or Minitab to help answer the following questions.a. Determine the mean, median, and standard deviation.b. Determine the first and third quartiles.c. Develop a
Listed below is the per capita income for the 50 states and the District of Columbia.Use a statistical software package such as Excel or Minitab to help answer the following questions.a. Determine the mean, median, and standard deviation.b. Determine the first and third quartiles.c. Develop a box
A sample of 12 homes sold last week in St. Paul, Minnesota, revealed the following information. Draw a scatter diagram. Can we conclude that, as the size of the home (reported below in thousands of square feet) increases, the selling price (reported in $ thousands) alsoincreases?
Refer to the following diagram.a. What is the graph called?b. What are the median, and first and third quartile values?c. Is the distribution positively skewed? Tell how you know.d. Are there any outliers? If yes, estimate these values.e. Can you determine the number of observations in the study?
1. Develop a graph or table that portrays the checking balances. What is the balance of a typical customer? Do many customers have more than $2,000 in their ac-counts? Does it appear that there is a difference in the distribution of the accounts among the four branches?Around what value do the
Wildcat Plumbing Supply has served the plumbing needs of Southwest Arizona for more than 40 years. The company was founded by Mr. Terrence St. Julian and is run today by his son Cory. The company has grown from a handful of employees to more than 500 today. Cory is concerned about several positions
At the January national sales meeting, the CEO of Kimble Products was questioned extensively regarding the company policy for paying commissions to its sales representatives. The company sells sporting goods to two major markets. There are 40 sales representatives who call directly on large-volume
Solve the following: a. 20! /17! b. 9P3 c. 7C2
Shaver Manufacturing Inc. offers dental insurance to its employees. A recent study by the human resource director shows the annual cost per employee per year followed the normal probability distribution, with a mean of $1,280 and a standard deviation of $420 per year.a. What fraction of the
A sample of 36 observations is selected from a normal population. The sample mean is 49, and the population standard deviation is 5. Conduct the following test of hypothesis using the .05 significance level.H0: µ = 50H1: µ ≠ 50(a) Is this a one- or two-tailed test?(b) What is the decision
A sample of 36 observations is selected from a normal population. The sample mean is 12, and the population standard deviation is 3. Conduct the following test of hypothesis using the .01 significance level.H0: µ ≤10H1: µ >10(a) Is this a one- or two-tailed test?(b) What is the decision
A sample of 36 observations is selected from a normal population. The sample mean is 21, and the population standard deviation is 5. Conduct the following test of hypothesis using the .05 significance level.H0: µ ≤20H1: µ >20(a) Is this a one- or two-tailed test?(b) What is the decision
A sample of 64 observations is selected from a normal population. The sample mean is 215, and the population standard deviation is 15. Conduct the following test of hypothesis using the .025 significance level.H0: µ ≤220H1: µ <220(a) Is this a one- or two-tailed test?(b) What is the decision
The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. Assume the mileage wear follows the normal distribution and the standard deviation of the distribution is 5,000 miles. Crosset Truck Company
The waiting time for customers at MacBurger Restaurants follows a normal distribution with a population standard deviation of 1 minute. At the Warren Road MacBurger, the quality assurance department sampled 50 customers and found that the mean waiting time was 2.75 minutes. At the .05 significance
A recent national survey found that high school students watched an average (mean) of 6.8 DVDs per month with a population standard deviation of 1.8. The distribution of DVDs watched per month follows the normal distribution. A random sample of 36 college students revealed that the mean number of
At the time she was hired as a server at the Grumney Family Restaurant, Beth Brigden was told, “You can average $80 a day in tips.” Assume the population of daily tips is normally distributed with a standard deviation of $9.95. Over the first 35 days she was employed at the restaurant, the mean
Given the following hypotheses:H0: µ ≤ 10H1: µ > 10A random sample of 10 observations is selected from a normal population. The sample mean was 12 and the sample standard deviation 3. Using the .05 significance level:a. State the decision rule.b. Compute the value of the test statistic.c.
Given the following hypotheses:H0: µ = 10H1: µ ≠10A random sample of 12 observations is selected from a normal population. The sample mean was 407 and the sample standard deviation 6. Using the .01 significance level:a. State the decision rule.b. Compute the value of the test statistic.c. What
The Rocky Mountain district sales manager of Rath Publishing Inc., a college textbook publishing company, claims that the sales representatives make an average of 40 sales calls per week on professors. Several reps say that this estimate is too low. To investigate, a random sample of 28 sales
The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart. The mean assembly time for a random sample of 24 carts, using the new method, was 40.6 minutes, and the standard deviation of the
The mean income per person in the United States is $40,000, and the distribution of in-comes follows a normal distribution. A random sample of 10 residents of Wilmington, Delaware, had a mean of $50,000 with a standard deviation of $10,000. At the .05 level of significance, is that enough evidence
Most air travelers now use e-tickets. Electronic ticketing allows passengers to not worry about a paper ticket, and it costs the airline companies less to handle than paper ticketing. However, in recent times the airlines have received complaints from passengers regarding their e-tickets,
Given the following hypotheses:H0: µ ≥20H1: µ < 20A random sample of five resulted in the following values: 18, 15, 12, 19, and 21. Assume a normal population. Using the .01 significance level, can we conclude the population mean is less than 20?a. State the decision rule.b. Compute the
Given the following hypotheses:H0: µ = 100H1: µ ≠ 100A random sample of six resulted in the following values: 118, 105, 112, 119, 105, and 111. Assume a normal population. Using the .05 significance level, can we conclude the mean is different from 100?a. State the decision rule.b. Compute the
The amount of water consumed each day by a healthy adult follows a normal distribution with a mean of 1.4 liters. A health campaign promotes the consumption of at least 2.0 liters per day. A sample of 10 adults after the campaign shows the following consumption in liters:At the .01 significance
The liquid chlorine added to swimming pools to combat algae has a relatively short shelf life before it loses its effectiveness. Records indicate that the mean shelf life of a 5-gallon jug of chlorine is 2,160 hours (90 days). As an experiment, Holdlonger was added to the chlorine to find whether
A Washington, D.C., â€œthink tankâ€ announces the typical teenager sent 50 text messages per day in 2013. To update that estimate, you phone a sample of 12 teenagers and ask them how many text messages they sent the previous day. Their responses were:At the .05 level, can you conclude that
Hugger Polls contends that an agent conducts a mean of 53 in-depth home surveys every week. A streamlined survey form has been introduced, and Hugger wants to evaluate its effectiveness. The number of in-depth surveys conducted during a week by a random sample of 15 agents are:At the .05 level of
According to the local union president, the mean gross income of plumbers in the Salt Lake City area follows the normal probability distribution with a mean of $45,000 and a standard deviation of $3,000. A recent investigative reporter for KYAK TV found, for a sample of 120 plumbers, the mean gross
Rutter Nursery Company packages its pine bark mulch in 50-pound bags. From a long history, the production department reports that the distribution of the bag weights follows the normal distribution and the standard deviation of this process is 3 pounds per bag. At the end of each day, Jeff Rutter,
A new weight-watching company, Weight Reducers International, advertises that those who join will lose, on the average, 10 pounds the first two weeks with a standard deviation of 2.8 pounds. A random sample of 50 people who joined the new weight reduction program revealed the mean loss to be 9
Dole Pineapple Inc. is concerned that the 16-ounce can of sliced pineapple is being over-filled. Assume the standard deviation of the process is .03 ounce. The quality-control department took a random sample of 50 cans and found that the arithmetic mean weight was 16.05 ounces. At the 5% level of
According to a recent survey, Americans get a mean of 7 hours of sleep per night. A random sample of 50 students at West Virginia University revealed the mean length of time slept last night was 6 hours and 48 minutes (6.8 hours). The standard deviation of the sample was 0.9 hour. At the 5% level
A statewide real estate sales agency, Farm Associates, specializes in selling farm property in the state of Nebraska. Its records indicate that the mean selling time of farm property is 90 days. Because of recent drought conditions, the agency believes that the mean selling time is now greater than
According to the Census Bureau, 3.13 people reside in the typical American household. A sample of 25 households in Arizona retirement communities showed the mean number of residents per household was 2.86 residents. The standard deviation of this sample was 1.20 residents. At the .05 significance
A recent article in Vitality magazine reported that the mean amount of leisure time per week for American men is 40.0 hours. You believe this figure is too large and decide to conduct your own test. In a random sample of 60 men, you find that the mean is 37.8 hours of lei-sure per week and that the
According to a study by the Federal Reserve Board, the rate charged on credit card debt is more than 14%. Listed below is the interest rate charged on a sample of 10 credit cards.Is it reasonable to conclude the mean rate charged is greater than 14%? Use the .01 significancelevel.
A recent article in The Wall Street Journal reported that the home equity loan rate is now less than 6%. A sample of eight small banks in the Midwest revealed the following home equity loan rates (in percent):At the .01 significance level, can we conclude that the home equity loan rate for small
A recent study revealed the typical American coffee drinker consumes an average of 3.1 cups per day. A sample of 12 senior citizens revealed they consumed the following amounts of coffee, reported in cups, yesterday.At the .05 significance level, do these sample data suggest there is a difference
The postanesthesia care area (recovery room) at St. Lukeâ€™s Hospital in Maumee, Ohio, was recently enlarged. The hope was that with the enlargement the mean number of patients per day would be more than 25. A random sample of 15 days revealed the following numbers of patients.At the .01
www.golfsmith.com receives an average of 6.5 returns per day from online shoppers. Fora sample of 12 days, it received the following numbers of returns.At the .01 significance level, can we conclude the mean number of returns is less than6.5?
During recent seasons, Major League Baseball has been criticized for the length of the games. A report indicated that the average game lasts 3 hours and 30 minutes. A sample of 17 games revealed the following times to completion.Can we conclude that the mean time for a game is less than 3.50 hours?
Watch Corporation of Switzerland claims that its watches on average will neither gain nor lose time during a week. A sample of 18 watches provided the following gains (1) or losses (2) in seconds per week.Is it reasonable to conclude that the mean gain or loss in time for the watches is 0? Use the
Listed below is the rate of return for one year (reported in percent) for a sample of 12 mutual funds that are classified as taxable money market funds.Using the .05 significance level, is it reasonable to conclude that the mean rate of return is more than4.50%?
Many grocery stores and large retailers such as Walmart and Kmart have installed self-checkout systems so shoppers can scan their own items and cash out themselves. How do customers like this service and how often do they use it? Listed below is the number of customers using the service for a
For a recent year, the mean fare to fly from Charlotte, North Carolina, to Chicago, Illinois, on a discount ticket was $267. A random sample of 13 round-trip discount fares on this route last month gives:
The publisher of Celebrity Living claims that the mean sales for personality magazines that feature people such as Angelina Jolie or Paris Hilton are 1.5 million copies per week. A sample of 10 comparable titles shows a mean weekly sales last week of 1.3 million copies with a standard deviation of
A United Nations report shows the mean family income for Mexican migrants to the United States is $27,000 per year. A FLOC (Farm Labor Organizing Committee) evaluation of 25 Mexican family units reveals a mean to be $30,000 with a sample standard deviation of $10,000. Does this information disagree
The cost of weddings in the United States has skyrocketed in recent years. As a result, many couples are opting to have their weddings in the Caribbean. A Caribbean vacation resort recently advertised in Bride Magazine that the cost of a Caribbean wedding was less than $10,000. Listed below is a
The American Water Works Association reports that the per capita water use in a single-family home is 69 gallons per day. Legacy Ranch is a relatively new housing development. The builders installed more efficient water fixtures, such as low-flush toilets, and subsequently conducted a survey of the
A cola-dispensing machine is set to dispense 9.00 ounces of cola per cup, with a standard deviation of 1.00 ounce. The manufacturer of the machine would like to set the control limit in such a way that, for samples of 36, 5% of the sample means will be greater than the upper control limit, and 5%
The owners of the Westfield Mall wished to study customer shopping habits. From earlier studies, the owners were under the impression that a typical shopper spends 0.75 hour at the mall, with a standard deviation of 0.10 hour. Recently the mall owners added some specialty restaurants designed to
The following null and alternate hypotheses are given.H0: µ ≤ 50H1: µ >50Suppose the population standard deviation is 10. The probability of a Type I error is set at .01 and the probability of a Type II error at .30. Assume that the population mean shifts from 50 to 55. How large a sample is
An insurance company, based on past experience, estimates the mean damage for a natural disaster in its area is $5,000. After introducing several plans to prevent loss, it randomly samples 200 policyholders and finds the mean amount per claim was $4,800 with a standard deviation of $1,300. Does it
A national grocer’s magazine reports the typical shopper spends 8 minutes in line waiting to check out. A sample of 24 shoppers at the local Farmer Jack’s showed a mean of 7.5 minutes with a standard deviation of 3.2 minutes. Is the waiting time at the local Farmer Jack’s less than that
Refer to the Real Estate data, which report information on the homes sold in Goodyear, Arizona, last year.a. A recent article in the Arizona Republic indicated that the mean selling price of the homes in the area is more than $220,000. Can we conclude that the mean selling price in the Goodyear,
Refer to the Baseball 2012 data, which report information on the 30 Major League Baseball teams for the 2012 season.a. Conduct a test of hypothesis to determine whether the mean salary of the teams was different from $80.0 million. Use the .05 significance level.b. Using a 5% significance level,
Refer to the Buena School District bus data.a. Select the variable for the number of miles traveled last month. Conduct a test of hypothesis to determine whether the mean number of miles traveled is equal to 840. Use the .01 significance level. Find the p-value and explain what it means.b. Using
A sample of 40 observations is selected from one population with a population standard deviation of 5. The sample mean is 102. A sample of 50 observations is selected from a second population with a population standard deviation of 6. The sample mean is 99. Conduct the following test of hypothesis
A sample of 65 observations is selected from one population with a population standard deviation of 0.75. The sample mean is 2.67. A sample of 50 observations is selected from a second population with a population standard deviation of 0.66. The sample mean is 2.59. Conduct the following test of
Gibbs Baby Food Company wishes to compare the weight gain of infants using its brand versus its competitor’s. A sample of 40 babies using the Gibbs products revealed a mean weight gain of 7.6 pounds in the first three months after birth. For the Gibbs brand, the population standard deviation of
As part of a study of corporate employees, the director of human resources for PNC Inc. wants to compare the distance traveled to work by employees at its office in downtown Cincinnati with the distance for those in downtown Pittsburgh. A sample of 35 Cincinnati employees showed they travel a mean
Women’s height is a suspected factor for difficult deliveries, that is, shorter women are more likely to have Caesarean sections. A medical researcher found in a sample of 45 women who had a normal delivery that their mean height was 61.4 inches. A second sample of 39 women who had a Caesarean
Mary Jo Fitzpatrick is the vice president for Nursing Services at St. Lukeâ€™s Memorial Hospital. Recently she noticed in the job postings for nurses that those that are unionized seem to offer higher wages. She decided to investigate and gathered the following information.Would it be
The null and alternate hypotheses are:H0: µ1 = µ2H1: µ1 ≠ µ2(a) State the decision rule, (b) Compute the pooled estimate of the population variance, (c) Compute the test statistic, (d) State your decision about the null hypothesis, and (e) Estimate the p-value.
The null and alternate hypotheses are:H0: µ1 = µ2H1: µ1 ≠ µ2A random sample of 15 observations from the first population revealed a sample mean of 350 and a sample standard deviation of 12. A random sample of 17 observations from the second population revealed a sample mean of 342 and a
Listed below are the 25 players on the opening-day roster of the 2013 New York Yankees Major League Baseball team, their salaries, and fielding positions.Sort the players into two groups, pitchers (P) and non-pitchers (position players). Assume equal population standard deviations for the position

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