Question

If a sample of size 41 is selected, the value of A for the probability P(-A ≤ t ≤ A) = 0.90 is:

Answer 1

Answer: 1.684

Explanation:

since sample size (n) is 41

confidence level = 0.90 = 90%

df = n - 1

df = 41 - 1

df = 40

that is For Degrees of Freedom = 40

significance level α = 1 - (confidence level / 100)

Significance Level α = 1 - (90/100 ) = 0.10

using the z-score

critical values of t = 1.684

A graph has been attached to further assist.