Mental health. The General Social Survey asked the question: “For how many days during the past30 days was your mental health, which includes stress, depression, and problems with emotions, not good?”Based on responses from 1,151 US residents, the survey reported a 95% confidence interval of 3.40 to 4.24days in 2010.(a) Interpret this interval in context of the data.(b) What does “95% confident” mean? Explain in the context of the application.(c) Suppose the researchers think a 99% confidence level would be more appropriate for this interval. Willthis new interval be smaller or wider than the 95% confidence interval?(d) If a new survey were to be done with 500 Americans, do you think the standard error of the estimatebe larger, smaller, or about the same.
Mental health. The General Social Survey asked the question: “For how many days during the past
30 days was your mental health, which includes stress, depression, and problems with emotions, not good?”
Based on responses from 1,151 US residents, the survey reported a 95% confidence interval of 3.40 to 4.24
days in 2010.
(a) Interpret this interval in context of the data.
(b) What does “95% confident” mean? Explain in the context of the application.
(c) Suppose the researchers think a 99% confidence level would be more appropriate for this interval. Will
this new interval be smaller or wider than the 95% confidence interval?
(d) If a new survey were to be done with 500 Americans, do you think the standard error of the estimate
be larger, smaller, or about the same.
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