A poll asked working adults about their job satisfaction. One question was \"All

Question

A poll asked working adults about their job satisfaction. One question was "All in all, which best describes how you feel about job? The possible answers were "love job, " "like job, " "dislike job" and "hate job" Sixty percent of the sample responded that they liked their job. Results were based on telephone interviews with 1.001 adults. The pull conclude with 95% confidence that the maximum margin of sampling error is 13 percentage points. The sample percent has approximately a normal sampling distribution.

Explanation / Answer

a) a. We cannot be certain but we are 95% confident

b) c. We obtained interval 57% to 63% by a method that includes mean 95% of the time

c) Standard deviation of estimated percent = sqrt( 0.60*0.40) / sqrt(1001)

= 0.015

d) c. Yes the confidence interval accounts for all error, including nonresponse and undercoverage

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