A survey of 381 adult females produced a mean height of 65.2 inches with a standard deviation of 2.8 inches. Construct a confidence interval based on a 95% confidence level. (64.83, 65.57)
(65.19, 65.21)
(64.96, 65.44)
(64.92, 65.48)

(64.92, 65.48)

Step-by-step explanation:

The given details are;

The number of adults in the survey, n = 381 adults

The mean height of the adults in the survey, = 65.2 inches

The standard deviation of the height of the adults in the survey, s = 2.8 inches

The confidence interval is given as follows;

The test statistic for a 95% confidence interval with α = 0.05, the degrees of freedom, df = n-1 = 381 - 1 = 380,   = =  1.97

Therefore, we get;

C.I =

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step-by-step explanation:

answer: the common difference is -0.10