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Statistics For Managers Using Microsoft Excel 7th Edition David M. Levine, David F. Stephan, Kathryn A. Szabat - Solutions

The U.S. Department of Education reports that 40% of full-time college students are employed while attending college. (Data extracted from National Center for Education Statistics, The Condition of Education 2012, nces.ed.gov/ pubs2012/2012045.pdf.) A recent survey of 60 full-time students at a
One of the issues facing organizations is increasing diversity throughout an organization. One of the ways to evaluate an organization's success at increasing diversity is to compare the percentage of employees in the organization in a particular position with a specific background to the
Of 801 surveyed active Linkedln members, 328 reported that they are planning to spend at least $1,000 on consumer electronics in the coming year. (Data extracted from bit.ly/RlTfFU.) At the 0.05 level of significance, is there evidence that the proportion of all Linkedln members who plan to spend
A cell phone provider has the business objective of wanting to estimate the proportion of subscribers who would upgrade to a new cell phone with improved features if it were made available at a substantially reduced cost. Data are collected from a random sample of 500 subscribers. The results
Actuation Consulting and Enterprise Agility recently conducted a global survey of product teams with the goal of better understanding the dynamics of product team performance and uncovering the practices that make these teams successful. One question posed was "In which of the following ways does
What is the difference between a null hypothesis, H0, and an alternative hypothesis, H1
What is the difference between a one-tail test and a two-tail test? Discuss.
What is the six-step critical value approach to hypothesis testing? Discuss.
What is the five-step p-value approach to hypothesis testing? Discuss.
In hypothesis testing, the common level of significance is α = 0.05. Some might argue for a level of significance greater than 0.05. Suppose that web designers tested the proportion of potential web page visitors with a preference for a new web design over the existing web design. The null
Financial institutions utilize prediction models to predict bankruptcy. One such model is the Altman Z-score model, which uses multiple corporate income and balance sheet values to measure the financial health of a company. If the model predicts a low Z-score value, the firm is in financial stress
The Pew Research Center conducted a survey of adults, aged 18 years and older, that included 1,954 cell-phone owners. The survey found that 1,016 of adult cell-phone owners use their phone while watching TV. (Data extracted from "The Rise of the Connected Viewer," Pew Internet & American Life
The owner of a gasoline station wants to study gasoline purchasing habits of motorists at his station. He selects a random sample of 60 motorists during a certain week, with the following results:• The amount purchased was = 11.3 gallons, 5 = 3.1 gallons.• Eleven motorists purchased
An auditor for a government agency was assigned the task of evaluating reimbursement for office visits to physicians paid by Medicare. The audit was conducted on a sample of 75 of the reimbursements, with the following results:• In 12 of the office visits, there was an incorrect amount of
A bank branch located in a commercial district of a city has the business objective of improving the process for serving customers during the noon-to-l:00 p.m. lunch period. The waiting time (defined as the time the customer enters the line until he or she reaches the teller window) of a random
A manufacturing company produces electrical insulators. If the insulators break when in use, a short circuit is likely to occur. To test the strength of the insulators, destructive testing is carried out to determine how much force is required to break the insulators. Force is measured by observing
An important quality characteristic used by the manufacturer of Boston and Vermont asphalt shingles is the amount of moisture the shingles contain when they are packaged. Customers may feel that they have purchased a product lacking in quality if they find moisture and wet shingles inside the
Studies conducted by the manufacturer of Boston and Vermont asphalt shingles have shown product weight to be a major factor in the customer's perception of quality. Moreover, the weight represents the amount of raw materials being used and is therefore very important to the company from a cost
The manufacturer of Boston and Vermont asphalt shingles provides its customers with a 20-year warranty on most of its products. To determine whether a shingle will last through the warranty period, accelerated-life testing is conducted at the manufacturing plant. Accelerated-life testing exposes
Accounting Today identified the top accounting firms in 10 geographic regions across the United States. Even though all 10 regions reported growth in 2011, the Southeast and Gulf Coast regions reported the highest combined growths, with 18% and 19%, respectively. A characteristic description of the
An important feature of digital cameras is battery life-the number of shots that can be taken before the batter) needs to be recharged. The file Cameras contains the battery life of 11 subcompact cameras and 7 compact cameras.a. Assuming that the population variances from both types of digital
A bank with a branch located in a commercial district of a city has the business objective of developing an improved process for serving customers during the noon-to-1 P.M. lunch period. Management decides to first study the waiting time in the current process. The waiting time is defined as the
Repeat Problem 10.12 (a), assuming that the population variances in the two branches are not equal. Compare these results with those of Problem 10.12 (a).
In intaglio printing, a design or figure is carved beneath the surface of hard metal or stone. The business objective of an intaglio printing company is to determine whether there are differences in the mean surface hardness of steel plates, based on two different surface conditions-untreated and
Repeat Problem 10.14 (a), assuming that the population variances from untreated and treated steel plates are not equal. Compare these results with those of Problem 10.14 (a).
An article appearing in The Exponent, an independent college newspaper published by the Purdue Student Publishing Foundation, reported that the average American college student spends one hour (60 minutes) on Face-book daily. (Data extracted from bit.ly/NQRCJQ.) But you wonder if there is a
Brand valuations are critical to CEOs, financial and marketing executives, security analysts, institutional investors, and others who depend on well-researched, reliable information needed for assessments, and comparisons in decision making. Millward Brown Optima has developed the BrandZ Top 100
Assume that you have a sample of n1 = 8, with the sample mean 1, = 42, and a sample standard deviation S1 = 4, and you have an independent sample of n2 = 15 from another population with a sample mean of 2 = 34 and a sample standard deviation S2 = 5.a. What is the value of the pooled -variance
Nine experts rated two brands of Colombian coffee in a taste-testing experiment. A rating on a 7-point scale (1 = extremely unpleasing, 7 = extremely pleasing) is given for each of four characteristics: taste, aroma, richness, and acidity. The following data stored in Coffee contain the ratings
How does cell phone service compare between different cities'.' The data stored in Cell Service represent the rating of Verizon and AT&T in 22 different cities.a. At the 0.05 level of significance, is there evidence of a difference in the mean cell phone service rating between Verizon and
Target versus Walmart: Who has the lowest prices? Given Walmart's slogan "Save Money-Live Better," you suspect that Walmart does. In order to test your suspicion, you identify 20 items (all brand-name items) currently on your household shopping list. You visit both Target and Walmart, price each
What motivates employees? The Great Place to Work Institute evaluated nonfinancial factors both globally and in the United States. (Data extracted from L. Petrecca, "Tech Companies Top List of 'Great Workplaces,'" USA Today, October 31, 2011, p. 7B.) The results, which indicate the importance
Multiple myeloma, or blood plasma cancer, is characterized by increased blood vessel formulation (angiogenesis) in the bone marrow that is a predictive factor in survival. One treatment approach used for multiple myeloma is stem cell transplantation with the patient's own stem cells. The data
Over the past year, the vice president for human resources at a large medical center has run a series of three- month workshops aimed at increasing worker motivation and performance. To check the effectiveness of the workshops, she selected a random sample of 35 employees from the personnel files.
The data in Concrete1 represent the compressive strength, in thousands of pounds per square inch (psi), of 40 samples of concrete taken two and seven days after pouring.a. At the 0.01 level of significance, is there evidence that the mean strength is lower at two days than at seven days?b. What
Let n1, = 100, X1, = 50, n2 = 100, and X2 = 30.a. At the 0.05 level of significance, is there evidence of a significant difference between the two population proportions?b. Construct a 95% confidence interval estimate for the dif¬ference between the two population proportions.
Let n1, = 100, X, = 45, n2 = 50, and X2 = 25.a. At the 0.01 level of significance, is there evidence of a significant difference between the two population proportions?b. Construct a 99% confidence interval estimate for the difference between the two population proportions.
A survey of 1,085 adults asked, "Do you enjoy shopping for clothing for yourself?" The results indicated that 51% of the females enjoyed shopping for clothing for themselves as compared to 44% of the males. (Data extracted from "Split Decision on Clothes Shopping," USA Today, January 28, 2011, p.
Do social recommendations increase ad effectiveness? A study of online video viewers compared viewers who arrived at an advertising video for a particular brand by following a social media recommendation link to viewers who arrived at the same video by web browsing. Data were collected on whether
A/B testing is a testing method that businesses use to test different designs and formats of a web page to determine whether a new web page is more effective than a current web page. Web designers at TravelTips.com tested a new call to action button on its web page. Every visitor to the web page
The consumer research firm Scarborough analyzed the 10% of American adults that are either "Superbanked" or "Unbanked." Superbanked consumers are defined as U.S. adults who live in a household that has multiple asset accounts at financial institutions, as well as some additional investments;
A survey was conducted of 665 consumer magazines on the practices of their websites. Of these, 273 magazines reported that online-only content is copy-edited as rigorously as print content; 379 reported that online-only content is fact-checked as rigorously as print content. (Data extracted from S.
How do Americans feel about ads on websites? A survey of 1,000 adult Internet users found that 670 opposed ads on websites. (Data extracted from S. Clifford, "Tacked for Ads? Many Americans Say No Thanks," The New York Times, September 30, 2009, p. B3.) Suppose that a survey of 1,000 Internet users
Where people turn for news is different for various age groups. (Data extracted from "Cell phone Users Who Access News on Their Phones," USA Today, March 1, 2010, p. 1A.) A study was conducted on the use of Cell phones for accessing news. The study reported that 47% of users under age 50 and 15% of
Determine the upper-tail critical values of F in each of the following two-tail tests.a. a = 0.10, n1 = 16, n2 = 21b. a = 0.05, n1= 16, n2 = 21c. a = 0.01, n1 = 16, n2 = 21
Determine the upper-tail critical value of F in each of the following one-tail tests.a. a = 0.05, n1 = 16, n2 = 21b. a = 0.01,n1 = 16, n2 = 21
The following information is available for two samples selected from independent normally distributed populations:Population A: n1 = 25 S21 = 16Population B: n2 = 25 S22 = 25a. Which sample variance do you place in the numerator of FSTAT?b. What is the value of FSTAT?
Construct a 95% confidence interval estimate of the population mean difference between μ1 and μ2. For information: Referring to Problem 10.2
Assume that two samples are selected from independent normally distributed populations.a. At the 0.05 level of significance, is there evidence of a difference between σ21 and σ22b. Suppose that you want to perform a one-tail test. At the 0.05 level of significance, what is the upper-tail critical
A problem with a telephone line that prevents a customer from receiving or making calls is upsetting to both the customer and the telecommunications company. The file Phone contains samples of 20 problems reported to two different offices of a telecommunications company and the time to clear these
Accounting Today identified the top accounting firms in 10 geographic regions across the United States. Even though all 10 regions reported growth in 2011, the Southeast and Gulf Coast regions reported the highest combined growths, with 18% and 19%, respectively. A characteristic description of the
A bank with a branch located in a commercial district of a city has the business objective of improving the process for serving customers during the noon-to-1 P.M. lunch period. To do so, the waiting time (defined as the number of minutes that elapses from when the customer enters the line until he
An important feature of digital cameras is battery life, the number of shots that can be taken before the battery needs to be recharged. The file Cameras contains the battery life of 11 subcompact cameras and 7 compact cameras. (Data extracted from "Cameras," Consumer Reports, July 2012, pp.
An article appearing in The Exponent, an independent college newspaper published by the Purdue Student Publishing Foundation, reported that the average American college student spends one hour (60 minutes) on Facebook daily. (Data extracted from bitly/NQRCJQ.) You wonder if there is a difference
Is there a difference in the variation of the yield of five-year certificates of deposit (CDs) in different cities? The file Five Year CD Rate contains the yields for a five-year CD for nine banks in New York and nine banks in Los Angeles, as of August 6, 2012. (Data extracted from www
What are some of the criteria used in the selection of a particular hypothesis-testing procedure? Discuss.
What is the distinction between two independent populations and two related populations? Discuss in detail.
When you have two independent populations, explain the similarities and differences between the test of hypothesis for the difference between the means and the confidence interval estimate for the difference between the means. Discuss in detail.
The American Society for Quality (ASQ) conducted a salary survey of all its members. ASQ members work in all areas of manufacturing and service-related institutions, with a common theme of an interest in quality. Two job titles are black belt and green belt. (See Section 18.6 for a description of
Do male and female students study the same amount per week? In a recent year, 58 sophomore business students were surveyed at a large university that has more than 1,000 sophomore business students each year. The file Study Times contains the gender and the number of hours spent studying in a
If n, = 5 and n2 = 4, at the 0.01 level of significance, is there evidence that μ1 > μ2?For Information: Referring to Problem 10.2
Do males and females differ in the amount of time they talk on the phone and the number of text messages they send? A study reported that women spent a mean of 818 minutes per month talking as compared to 716 minutes per month for men. (Data extracted from "Women Talk and Text More," USA Today,
The file Restaurants contains the ratings for food, decor, service, and the price per person for a sample of 50 restaurants located in a city and 50 restaurants located in a suburb. Completely analyze the differences between city and suburban restaurants for the variables food rating, decor rating,
A computer information systems professor is interested in studying the amount of time it takes students enrolled in the Introduction to Computers course to write a program in Visual Basic. The professor hires you to analyze the following results (in minutes), stored in VB, from a random sample of
Do men and women differ in the number of online friends that they have? A study of 3,011 people reported that men had a mean of 180 friends and women had a mean of 140 friends. Suppose that the study consisted of 1,511 men and 1,500 women and that the standard deviation of the number of friends was
The lengths of life (in hours) of a sample of 40 100-watt light bulbs produced by manufacturer A and a sample of 40 100-watt light bulbs produced by manufacturer B are stored in Bulbs. Completely analyze the differences between the lengths of life of the bulbs produced by the two manufacturers.
A hotel manager looks to enhance the initial impressions that hotel guests have when they check in. Contributing to initial impressions is the time it takes to deliver a guest's luggage to the room after check-in. A random sample of 20 deliveries on a particular day was selected in Wing A of the
The owner of a restaurant that serves Continental-style entrees has the business objective of learning more about the patterns of patron demand during the Friday-to-Sunday weekend time period. She decided to study the demand for dessert during this time period. In addition to studying whether a
The manufacturer of Boston and Vermont asphalt shingles knows that product weight is a major factor in the customer's perception of quality. Moreover, the weight represents the amount of raw materials being used and is therefore very important to the company from a cost standpoint. The last stage
The manufacturer of Boston and Vermont asphalt shingles provides its customers with a 20-year warranty on most of its products. To determine whether a shingle will last as long as the warranty period, the manufacturer conducts accelerated-life testing. Accelerated-life testing exposes the shingle
There are a very large number of mutual funds from which an investor can choose. Each mutual fund has its own mix of different types of investments. The data BestFunds1 present the one-year return and the three-year annualized return for the 10 best mutual funds, according to the U.S. News &
When people make estimates, they are influenced by anchors to their estimates. A study was conducted in which students were asked to estimate the number of calories in a cheeseburger. One group was asked to do this after thinking about a calorie-laden cheesecake. A second group was asked to do this
A recent study ("Snack Ads Spur Children to Eat More," The New York Times, July 20, 2009, p. B3) found that children who watched a cartoon with food advertising ate, on average, 28.5 grams of Goldfish crackers as compared to an average of 19.7 grams of Goldfish crackers for children who watched a
A problem with a phone line that prevents a customer from receiving or making calls is upsetting to both the customer and the telecommunications company. The file phone contains samples of 20 problems reported to two different offices of a telecommunications company and the time to clear these
An experiment has a single factor with five groups and seven values in each group. a. How many degrees of freedom are there in determining the among-group variation? b. How many degrees of freedom are there in determining the within-group variation? c. How many degrees of freedom are there in
A manufacturer of pens has hired an advertising agency to develop an advertising campaign for the upcoming holiday season. To prepare for this project, the research director decides to initiate a study of the effect of advertising on product perception. An experiment is designed to compare five
QSR has been reporting on the largest quick-serve and fast-casual brands in the United States for nearly 15 years. The file QSR contains the food segment (burger, chicken, pizza, or sandwich) and U.S. average sales per unit ($thou-sands) for each of 58 quick-service brands. (Data extracted from
Researchers conducted a study to determine whether graduates with an academic background in the discipline of leadership studies were better equipped with essential soft skills required to be successful in contemporary organizations than students with no leadership education and/or students with a
A pet food company has a business objective of expanding its product line beyond its current kidney- and shrimp-based cat foods. The company developed two new products, one based on chicken liver and the other based on salmon. The company conducted an experiment to compare e two new products with
A sporting goods manufacturing company wanted to compare the distance traveled by golf balls produced using four different designs. Ten balls were manufactured with each design and were brought to the local golf course for the club professional to test. The order in which the balls were hit with
Consider a two-factor factorial design with three levels for factor A, three levels for factor B, and four replicates in each of the nine cells. a. How many degrees of freedom are there in determining the factor A variation and the factor B variation? b. How many degrees of freedom are there in
Assume that you are working with the results from Problem 11.15, and SSA = 120, SSB = 110, SSE = 270, and SST = 540.a. What is SSAB?b. What are MSA and MSB?c. What is MSAB?d. What is MSE?
Assume that you are working with the results from Problems 11.15 and 11.16.a. What is the value of the FSTAT test statistic for the interaction effect?b. What is the value of the FSTAT test statistic for the factor A effect?c. What is the value of the FSTAT test statistic for the factor B effect?d.
Given the results from Problems 11.15 through 11.17, a. At the 0.05 level of significance, is there an effect due to factor A? b. At the 0.05 level of significance, is there an effect due to factor B? c. At the 0.05 level of significance, is there an interaction effect?
Given a two-way ANOVA with two levels for factor A, five levels for factor B, and four replicates in each of the 10 cells, with SSA = 18, SSB = 64, SSE = 60, and SST = 150,a. Form the ANOVA summary table and fill in all values in the body of the table.b. At the 0.05 level of significance, is there
You are working with the same experiment as in Problem 11.1. a. If SSA = 60 and SST = 210, what is SSW? b. What is MSA? c. What is MSW? d. What is the value of FSTAT?
Given a two-factor factorial experiment and the ANOVA summary table that follows, fill in all the missing results:
Given the results from Problem 11.20,a. At the 0.05 level of significance, is there an effect due to factor A?b. At the 0.05 level of significance, is there an effect due to factor B?c. At the 0.05 level of significance, is there an interaction effect?
The effects of developer strength (factor A) and development time (factor B) on the density of photographic plate film were being studied. Two strengths and two development times were used, and four replicates in each of the four cells were evaluated. The results (with larger being best) are stored
A chef in a restaurant that specializes in pasta dishes was experiencing difficulty in getting brands of pasta to be al dente-that is, cooked enough so as not to feel starchy or hard but still feel firm when bit-ten into. She decided to conduct an experiment in which two brands of pasta, one
A student team in a business statistics course performed a factorial experiment to investigate the time required for pain-relief tablets to dissolve in a glass of water. The two factors of interest were brand name (Equate, Kroger, or Alka-Seltzer) and water temperature (hot or cold). The experiment
A metallurgy company wanted to investigate the effect of the percentage of ammonium and the stir rate on the density of the powder produced. The results (stored in Density) are as follows:At the 0.05 level of significance,a. Is there an interaction between the percentage of ammonium and the stir
An experiment was conducted to try to resolve a problem of brake discs overheating at high speed on construction equipment. Five different brake discs were measured by two different temperature gauges. The temperature of each brake disc and gauge combination was measured at eight different times
You are working with the same experiment as in Problems 11.1 and 11.2.a. Construct the ANOVA summary table and fill in all values in the table.b. At the 0.05 level of significance, what is the upper-tail critical value from the F distribution?c. State the decision rule for testing the null
What is the difference between the one-way ANOVA F test and the Levene test? In detail.
Under what conditions should you use the two-way ANOVA F test to examine possible differences among the means of each factor in a factorial design? Discuss.
What is meant by the concept of interaction in a two-factor factorial design? Discuss.
The operations manager for an appliance manufacturer wants to determine the optimal length of time for the washing cycle of a household clothes washer. An experiment is designed to measure the effect of detergent brand and washing cycle time on the amount of dirt removed from standard household
The quality control director for a clothing manufacturer wants to study the effect of operators and machines on the breaking strength (in pounds) of wool serge material. A batch of the material is cut into square-yard pieces, and these pieces are randomly assigned, 3 each, to each of the 12

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