Question

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3. The sample size needed to estimate a population mean within 2 units with a 95% confidence when the population standard deviation equals 8 is a. 9 b. 61 c) 62 d. 8

Answer 1

Solution :

Given that,

Z_$\alpha$/2 = 1.96

sample size = n = [Z_$\alpha$/2* $\sigma$ / E] ²

n = [1.96 * 8 / 2]²

n = 62

Sample size = n = 62