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Detailed suweys were sent to morę than 13,000 organizations on the Internet; 1,468 usable responses were received. According to Mr. Quarterman, the margin of error is 2.8 percent, with a confidence level of 95 percent.2
(a) What was the response ratę for this survey? (The response ratę is the percent of the planned sample that responded.)
(b) Do you think that the smali margin of error is a good measure of the accuracy pf the survey s results? Explain your answer.
You want to rent an unfurnished one-bedroom apartment for next semester. The mean monthly rent for a random sample of 10 apartments advertised in the local newspaper is $540. Assume that the standard deviation is $80. Find a 95% confidence interval for the mean monthly rent for unfurnished one-bedroom apartments available for rent in this community.
A ąuestionnaire about study habits was given to a random sample of students taking a large introductory statistics class. The sample of 25
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