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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
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

13. A linear trend equation is used to represent time series values when the data are changing by equal what?
a) amounts
b) percents and proportions
c) proportions
d) percents

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

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