Deciding which confidence interval to use: Here is a list of confidence interval

Question

Deciding which confidence interval to use: Here is a list of confidence intervals we have studied so far this semester. For questions 6 through 8, identify the one confidence interval that is most appropriate for the given situation. You may use a confidence interval once, more than once, or not at all. In the answer box type in the letter, a, b, c...etc.
a. One sample z-confidence interval
b. One sample t-confidence interval
c. Paired-samples t-confidence interval
d. Independent samples t-confidence interval
e. Confidence interval for one proportion
f. Confidence interval for two proportions 6. A bank employs two appraisers. When approving borrowers for mortgages, it is imperative that the appraisers value the same types of properties consistently. To make sure this is the case, the bank evaluates six properties that both appraisers had recently valued. Which confidence interval would be most appropriate for this study? 7. In a Wall Street Journal article on satisfaction with career paths, the percentage of psychology majors reporting they were “satisfied” with their career path was reported. The same data was also reported for accounting majors. You decide to construct a 95% confidence interval to see if the observed difference is significant. Which confidence interval would be most appropriate for this study? 8. DoubleStuf Oreo cookies are supposed to have twice the filling of regular Oreo cookies. You and some friends decide you want to know if that is a true assertion by the company who makes them. You take a sample of 55 DoubleStuf Oreo cookies and measure the amount of filling in each one. You need to construct a confidence interval to estimate the true mean filling amount of DoubleStuf Oreos in order to compare it to the filling amount in regular Oreos. Which confidence interval would be most appropriate for this study? Deciding which confidence interval to use: Here is a list of confidence intervals we have studied so far this semester. For questions 6 through 8, identify the one confidence interval that is most appropriate for the given situation. You may use a confidence interval once, more than once, or not at all. In the answer box type in the letter, a, b, c...etc.
a. One sample z-confidence interval
b. One sample t-confidence interval
c. Paired-samples t-confidence interval
d. Independent samples t-confidence interval
e. Confidence interval for one proportion
f. Confidence interval for two proportions

Explanation / Answer

6)c. Paired-samples t-confidence interval

7)

f. Confidence interval for two proportions

8)

b. One sample t-confidence interval

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