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Chapter 8: Q 67. (page 542)
Blood pressure A medical study finds that and
for the seated systolic blood pressure of the randomly selected adults. What is the standard error of the mean? Interpret this value in context.
Mean standard error is
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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?
More prayer in school Refer to Exercise . Interpret the confidence level.
Many television viewers express doubts about the validity of certain commercials. In an attempt to answer their critics, Timex Group USA wishes to estimate the true proportion p of all consumers who believe what is shown in Timex television commercials. What is the smallest number of consumers that Timex can survey to guarantee a margin of error of or less at a confidence level?
a.
b.
c.
d.
e.
Household income The American Community Survey estimated the median
household income for each state. According to ACS, the confidence interval for the median household income in Arizona is .
a. Interpret the confidence interval.
b. Interpret the confidence level.
Reading scores in Atlanta The Trial Urban District Assessment (TUDA) is a
government-sponsored study of student achievement in large urban school districts. TUDA gives a reading test scored from to . A score of is a 鈥渂asic鈥� reading level and a score of is 鈥減roficient.鈥� Scores for a random sample of eighth-graders in Atlanta had a mean of with standard deviation of
a. Construct and interpret a confidence interval for the mean reading test score of all Atlanta eighth-graders.
b. Based on your interval from part (a), is there convincing evidence that the mean reading test score for all Atlanta eighth-graders is less than the basic level? Explain your answer.
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