1.You are interested in the average annual salary of American public health professionals. So, you took a random sample and...

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1.You are interested in the average annual salary of American public health professionals. So, you took a random sample and found that the mean annual salary is $53,145. Suppose you knew from previous studies that the standard deviation of the annual salary is $16, 451. (Hint: given the population standard deviation is given, use the Z Table). 

 

      1). Please find a 95% confidence interval for the mean salary, given the following sample size: (a) n = 36, (b) n = 64, (c) n = 144.

 

 

 

 

     (2) How does the range of values (i.e. Margin of Error) change when the sample size (n) changes?  

 

 

 

 

      (3) When the confidence level changes from 95% to 99%, what will be the confidence interval for a sample of n=36?

 

 

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