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A random sample of 21

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A random sample of 21

style=”color:rgb(0,0,0);background-color:transparent;”> ​people, the mean commute time to work was 32.6 minutes and the standard deviation was 7.2 minutes.

Assume the population is normally distributed and use a​ t-distribution to construct a 90​% confidence interval for the population mean μ.

What is the margin of error of μ​?

The confidence interval for the population mean μ is

 
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