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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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We love football! A Gallup poll conducted telephone interviews with a random sample of adults aged 18 and older. Data were obtained for 1000 people. Of these, 370 said that football is their favorite sport to watch on television.
a. Define the parameter p in this setting.
b. What point estimator will you use to estimate p? What is the value of the point estimate?
c. Do you believe that the value of the point estimate is equal to the value of p? Explain your answer.
Catching goldfish for schoolCarly and Maysem plan to be preschool teachers after they graduate from college. To prepare for snack time, they want to know the mean number of goldfish crackers in a bag of original-flavored goldfish. To estimate this value, they randomly selected bags of original-flavored goldfish and counted the number of crackers in each bag. Here are their data:
Construct and interpret a confidence interval for the true mean number of crackers in a bag of original- flavored goldfish.
America’s favorite cookie Ann and Tori wanted to estimate the average weight of an Oreo cookie to determine if it was less than advertised (34 grams for 3 cookies). They selected a random sample of cookies and found the weight of each cookie (in grams). The mean weight was grams with a standard deviation of grams. Construct and interpret a confidence interval for the true mean weight of an Oreo cookie.
The SAT againHigh school students who take the SAT Math exam a second time
generally score higher than on their first try. Past data suggest that the score increase has a standard deviation of about points. How large a sample of high school students would be needed to estimate the mean change in SAT score to within points with confidence?
You want to compute a confidence interval for the mean of a population with an unknown population standard deviation. The sample size is . What critical value should you use for this interval?
a.
b.
c.
d.
e.
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