Question

Consider an x distribution with standard deviation σ = 50. (For each answer, enter an exact number.) (a) If specifications for a research project require the standard error of the corresponding x bar distribution to be 2, how large does the sample size need to be? n = Incorrect: Your answer is incorrect. . (b) If specifications for a research project require the standard error of the corresponding x bar distribution to be 1, how large does the sample size need to be? n = Incorrect: Your answer is incorrect. .

Answer 1

a) standard error = sd / sqrt(n)

or, 2 = 50 / sqrt(n)

or, n = 625

b) 1 = 50 / sqrt(n)

or, n = 2500

Answer 2