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Chapter 8: Q. T8.2 (page 549)
The weights (in pounds) of three adult males are,and. What is the standard error of the mean for these data?
a.
b.
c.
d.
e.
The standard error of the mean is
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Got shoes? How many pairs of shoes, on average, do female teens have? To find out, an AP Statistics class selected an SRS of female students from their school.
Then they recorded the number of pairs of shoes that each student reported having. Here
are the data:
A school of fish Refer to Exercise 74.
a. Explain why it was necessary to inspect a graph of the sample data when checking the Normal/Large Sample condition.
b. According to the packaging, there are supposed to be goldfish in each bag of crackers. Based on the interval, is there convincing evidence that the average number of goldfish is less than ? Explain your answer.
A quality control inspector will measure the salt content (in milligrams) in a random
sample of bags of potato chips from an hour of production. Which of the following would result in the smallest margin of error in estimating the mean salt content ?
a. confidence;
b. confidence;
c. confidence;
d. confidence;
e. n = 100 at any confidence level
Bone loss by nursing mothers Breast-feeding mothers secrete calcium into
their milk. Some of the calcium may come from their bones, so mothers may lose bone mineral. Researchers measured the percent change in bone mineral content (BMC) of the spines of randomly selected mothers during three months of breast-feeding. The mean change in BMC was and the standard deviation was
a. Construct and interpret a confidence interval to estimate the mean percent change in BMC in the population of breast-feeding mothers.
b. Based on your interval from part (a), do these data give convincing evidence thatnursing mothers lose bone mineral, on average? Explain your answer.
Selling online According to a recent Pew Research Center report, many
American adults have made money by selling something online. In a random sample of American adults, reported that they earned money by selling something online in the previous year. Assume the conditions for inference are met.
Determine the critical value for a confidence interval for a proportion.
b. Construct a confidence interval for the proportion of all American adults who
would report having earned money by selling something online in the previous year.
c. Interpret the interval from part (b).
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