a) For Health care/Social assistance, give the 95% confidence
interval for percentage of people in that industry
who smoke. (You are not expected to be able to estimate this
perfectly from the figure! Do your best.)
b) For the various industries, the 95% confidence intervals appear to differ in size. For example, the confidence interval for mining is very big, and that for services is very small. Keeping in mind that all these are all 95% confidence intervals, provide a reasonable idea for why this is.
Homework Answers
a) The 95% confidence interval for Construction is 25 to 31.
The 95% confidence interval for Mining is 24 to 32.
The 95% confidence interval for Manufacturing is 22 to 24.
The 95% confidence interval for Transportation/Warehousing/Utilities is 21 to 25.
The 95% confidence interval for Wholesale and retail trade is 21 to 23.
The 95% confidence interval for Agriculture/Forestry/Fishing is 16 to 22.
The 95% confidence interval for Services is 16.5 to 17.5.
The 95% confidence interval for Health care/Social assistance is 15 to 17.
b) The confidence intervals appear to differ in size because the sample size is different for each of the industries.
Good luck with your studies!!!
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a) For Health care/Social assistance, give the 95% confidence
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