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  3. 1. construct an 80​% confidence interval to

1. Construct an 80​% confidence interval to estimate the population mean when x overbarx=128 and s​...

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Statistics

1. Construct an 80​% confidence interval to estimate thepopulation mean when x overbarx=128 and s​ =27 for the sample sizesbelow.​

a)n=20       

​b)n=50       

​c)n=90

​a) The 80​% confidence interval for the population mean whenn=20 is from a lower limit of ____ to an upper limit of _____.(Round to two decimal places as​ needed.)

_______________________________________________________________________

2. Determine the margin of error for a confidence interval toestimate the population mean with n=25 and s-12.5 for the followingconfidence levels:

a. 80% b. 90% c.99%

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