QNT 561 Final Exam University of Phoenix New Courses

QNT 561 Final Exam Assignment 

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1. A random sample of size 15 is selected from a normal population. The population standard 

deviation is unknown. Assume the null hypothesis indicates a two-tailed test and the 

researcher decided to use the 0.10 significance level. For what values of t will the null 

hypothesis not be rejected? 

a) To the left of -1.645 or to the right of 1.645 

b) To the left of -1.345 or to the right of 1.345 

c) Between -1.761 and 1.761 

d) To the left of -1.282 or to the right of 1.282 

2. Which of the following is a characteristic of the F distribution? 

a) Normally distributed 

b) Negatively skewed 

c) Equal to the t-distribution 

d) Positively skewed 

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3. For a chi-square test involving a contingency table, suppose the null hypothesis is 

rejected. We conclude that the two variables are __________. 

a) related 

b) curvilinear 

c) linear 

d) not related 

4. A sales manager for an advertising agency believes that there is a relationship between 

the number of contacts that a salesperson makes and the amount of sales dollars earned. 

What is the dependent variable? 

a) sales managers 

b) amount of sales dollars 

c) salesperson 

d) number of contacts 

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5. Which of the following is most appropriately displayed with a frequency table? 

a) What percentage of people prefer Hunt's brand ketchup 

b) The home location of the most valuable customers 

c) How much explanatory value comes from the study's variables 

d) The relationship between gender and job performance 

6. The manager of Paul's fruit and vegetable store is considering the purchase of a new 

seedless watermelon from a wholesale distributor. Since this seedless watermelon costs $4, 

will sell for $7, and is highly perishable, he only expects to sell between six and nine of them. 

What is the opportunity loss for purchasing nine watermelons when the demand is for seven 

watermelons? 

a) 8 

b) 4 

c) 12 

d) 0 

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7. A firm offers routine physical examinations as part of a health service program for its 

employees. The exams showed that 8% of the employees needed corrective shoes, 15% 

needed major dental work, and 3% needed both corrective shoes and major dental work. 

What is the probability that an employee selected at random will need either corrective shoes 

or major dental work? 

a) .25 

b) 1.00 

c) .50 

d) .20 

8. When data is collected using a qualitative, nominal variable, what is true about a frequency 

distribution that summarizes the data? 

a) The upper and lower class limits must be calculated. 

b) The number of classes is equal to the number of variables plus 2. 

c) The “5 to the k rule” can be applied. 

d) A pie chart can be used to summarize the data. 

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9. If an ANOVA test is conducted and the null hypothesis is rejected, what does this indicate? 

a) The p-value is less than a. 

b) All population means are different. 

c) At least one pair of population means is different. 

d) The population means are equal. 

10. A random sample of 20 items is selected from a population. When computing a confidence 

interval for the population mean, what number of degrees of freedom should be used to 

determine the appropriate t-value? 

a) 25 

b) 21 

c) 19 

d) 20 

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11. The question, "Should products be withdrawn if even one death is associated with its 

prescribed use, even if no fault for the tampered product accrues to the manufacturer?" is an 

example of a(n) _____. 

a) strip data mining issue 

b) unresearchable question 

c) ill-defined problem 

d) favored-technique problem 

12. A large department store examined a sample of the 18 credit card sales and recorded the 

amounts charged for each of three types of credit cards: MasterCard, Visa, and Discover. Six 

MasterCard sales, seven Visa, and five Discover sales were recorded. The store used an ANOVA 

to test if the mean sales for each credit card were equal. What are the degrees of freedom for 

the F statistic? 

a) 2 in the numerator, 15 in the denominator 

b) 6 in the numerator, 15 in the denominator 

c) 18 in the numerator, 3 in the denominator 

d) 3 in the numerator, 18 in the denominator 

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13. A linear trend equation is used to represent time series values when the data are changing 

by equal what? 

a) amounts 

b) percent’s and proportions 

c) proportions 

d) percent’s 

14. Which of the following goals should a good survey instrument accomplish? 

a) Encourage each participant to provide accurate responses 

b) Encourage participants to be succinct in their responses 

c) Encourage participants to answer only those questions they are comfortable answering 

d) Encourage participants to end the survey when they feel they have contributed enough 

information 

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15. Kroger, a grocery store chain, wants to identify the ideal store layout for increasing store sales. Because 

it primarily uses two store designs, one a grid layout with vertical aisles divided by a center aisle and 

another using a traditional straight-aisle pattern, Kroger will match pairs of stores that have different 

designs but similar shopper demographics and location. Sales from each pair will then be compared to 

determine if store design is related to sales. Which type of study is this an example of? 

a) Exploratory study 

b) Case study 

c) Ex post facto study 

d) Longitudinal study 

16. Bones Brothers & Associates prepare individual tax returns. Over prior years, Bones Brothers has 

maintained careful records regarding the time to prepare a return. The mean time to prepare a return is 90 

minutes and the standard deviation of this distribution is 14 minutes. Suppose 100 returns from this year 

are selected and analyzed regarding the preparation time. What assumption do you need to make about the 

shape of the population distribution of all possible tax preparation times to make inferences about the 

mean time to complete a tax form? 

a) The population distribution is skewed to the left. 

b) The population distribution is skewed to the right. 

c) The shape of the population distribution does not matter. 

d) The population distribution is normal. 

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17. Checklists with several items to be considered by respondents may be subject to _____. 

a) recency effects 

b) leniency effects 

c) halo effects 

d) primacy effects 

18. In a multiple rating list scale, ____. 

a) participants rate multiple items on a 3-point scale 

b) the participant is restricted to circling their rating 

c) it is possible to visualize the results better than with other numerical scales 

d) the data generated are always ordinal 

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19. As the size of the sample increases, what happens to the shape of the distribution of 

sample means? 

a) It cannot be predicted in advance 

b) It is positively skewed 

c) It is negatively skewed 

d) It approaches a normal distribution 

20. For any chi-square goodness-of-fit test, the number of degrees of freedom is found by 

______. 

a) n + k 

b) k -1 

c) n – k - 1 

d) n + 1 

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21. Bank Choice is concerned about stagnating profits and asks, "How can profitability be 

improved?" This is an example of a (n) _____. 

a) research question 

b) measurement question 

c) management question 

d) investigative question 

22. A machine is set to fill the small-size packages of M&M candies with 56 candies per bag. A 

sample revealed three bags of 56, two bags of 57, one bag of 55, and two bags of 58. To test 

the hypothesis that the mean candies per bag is 56, how many degrees of freedom are there? 

a) 1 

b) 7 

c) 9 

d) 8 

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23. An experimental study is one that _____. 

a) attempts to reveal why or how one variable produces changes in another 

b) involves manipulation of one or more variables to determine the effect on another variable 

c) attempts to capture a population's characteristics by making inferences from a sample's 

characteristics and testing resulting hypotheses 

d) discovers answers to the questions who, what, when, where, or how much 

24. The monthly salaries of a sample of 100 employees were rounded to the nearest $10. 

They ranged from a low of $1,040 to a high of $1,720. If we want to condense the data into 

seven classes, what is the most convenient class interval? 

a) $200 

b) $50 

c) $150 

d) $100 

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25. Consider a regression analysis, where the correlation coefficient is 0.18. Then, the 

coefficient of determination is _______. 

a) .0324 

b) .36 

c) 1.16 

d) .424 

26. In multiple regression analysis, when the independent variables are highly correlated, this 

situation is called __________________. 

a) homoscedasticity 

b) curvilinearity 

c) multicollinearity 

d) autocorrelation 

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27. Sam's Club installed self-checkout stations that can track not only member's purchases but 

also packaging problems, as the system uses universal product codes to match the item the 

shopper has in their cart with its price and inventory level in the store, generating a 

spreadsheet style report for the researcher. If you consider the scanner as the tool for 

collecting data for Sam's researchers, they are doing data entry by ____. 

a) spreadsheet 

b) Optical Character Recognition 

c) Field editing 

d) Voice recognition 

28. The weekly incomes of a large group of executives are normally distributed with a mean of 

$2,000 and a standard deviation of $100. What is the z-score for an income of $2,100? 

a) 1.683 

b) 0.90 

c) 2.00 

d) 1.00 

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29. A ranking scale is a scale that _____. 

a) scores an object without making a direct comparison to another object 

b) groups participants 

c) groups concepts according to specific criteria 

d) scores an object by making a comparison and determining order among two or more objects 

30. What is the interpretation of a 96% confidence level? 

a) The interval contains 96% of all sample means. 

b) Approximately 96 out of 100 such intervals would include the true value of the population 

parameter. 

c) There's a 96% chance that the given interval includes the true value of the population 

parameter. 

d) There's a 4% chance that the given interval does not include the true value of the population 

parameter. 

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