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Chapter 8: Q 29. (page 522)
Rating school food Latoya wants to estimate the proportion of the seniors
at her boarding school who like the cafeteria food. She interviews an SRS of of the seniors and finds that think the cafeteria food is good.
Sample size condition ofdo not meet.
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How confident? The figure shows the result of taking SRSs from a Normal population and constructing a confidence interval for the population mean using each sample. Which confidence level鈥�鈥攄o you think was used? Explain your reasoning.
More cheating Refer to Exercise 36. Calculate and interpret the standard error of for these data.
Scientists collect data on the blood cholesterol levels (milligrams per deciliter of blood) of a random sample of laboratory rats. A confidence interval for the mean blood cholesterol level is to . Which of the following would cause the most worry about the validity of this interval?
a. There is a clear outlier in the data.
b. A stem plot of the data shows a mild right skew.
c. You do not know the population standard deviation .
d. The population distribution is not exactly Normal.
e. None of these are a problem when using a interval.
Gambling and the NCAA Gambling is an issue of great concern to those involved in college athletics. Because of this concern, the National Collegiate Athletic Association (NCAA) surveyed randomly selected student athletes concerning their gambling-related behaviors. Of the Division male athletes who responded to the survey, reported participation in some gambling behavior. This includes playing cards, betting on games of skill, buying lottery tickets, betting on sports, and similar activities. A report of this study cited a margin of error.
a. The confidence level was not stated in the report. Use what you have learned to
estimate the confidence level, assuming that the NCAA took an SRS.
b. The study was designed to protect the anonymity of the student athletes who responded. As a result, it was not possible to calculate the number of students who were asked to respond but did not. How does this fact affect the way that you interpret the results?
Pepperoni pizza Melissa and Madeline love pepperoni pizza, but sometimes they are disappointed with the small number of pepperonis on their pizza. To
investigate, they went to their favorite pizza restaurant at random times during the week and ordered a large pepperoni pizza. Here are the number of pepperonis on each pizza:
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