Confidence interval exercise

Given the following information determine the 95% confidence interval for each mean:

    N = 20, s2 = 9, M = 14.1

    N = 30, s2 = 10, M = 98.9

    N = 12, s2 = 6, M = 1.5

    N = 25, s2 = 14, M = 16

    Formula for 95% confidence interval:

    M + 1.96 * (s/ √N)

    observed mean plus and minus (1.96 times the (standard deviation divided by the square root of the sample size))

     

Five easy steps for calculating a confidence interval

 

 

COM 582 Descriptive and Experimental Research in Communication

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