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School

Brigham Young University *

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121

Subject

Statistics

Date

Feb 20, 2024

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png

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Uploaded by DrSquirrelMaster1014

1/1 points 7. If the researchers wished to have a narrower interval than the confidence interval in the previous problem, what would be an appropriate course of action? A. Decrease the sample size v B. Increase the sample size C. Increase the confidence level v D. Decrease the confidence level 2/2 points 8. To follow up with the Quick Service Restaurant (QSR) drive-thru study, a researcher decided to begin investigating if the percent of accurate in-store orders differed from the 93% accuracy rate observed in the drive-thru study. As an initial data collection, the researcher visited 15 randomly sampled Chick-fil-A stores and found that 11 of the 15 orders were correct. A 95% confidence interval was then calculated as (0.510, 0.957). On the basis of this interval, at the 0.05 level, can we say that the proportion of accurate in-store orders is different than 93% observed in the drive-thru study? v A. No, we shouldn't trust the results of the in-store study because the normal sampling distribution for z does not apply because the sample size is too small B. No, because 0.93 is in the interval C. No, because we can't use a confidence interval to perform a hypothesis test D. Yes because 0.93 is not in the interval 1/1 points

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