Question

QUESTION 3 All things being equal, which is correct? As the confidence level increases, the margin of error gets larger. As the sample size increases, the confidence interval gets wider. As the standard deviation increases, the margin of error gets smaller. As the sample mean increases, the margin of error gets larger.

Answer 1

3

a) margin of error(E) = 2a/2 * Vn

and

b) con fidence interval = 2a/2 * –

question 1
we know, as the confidence level increases, value of z score increases which in turn increases the margin of error (refer formula (a)
so, here, OPTION A is correct

question 2
OPTION D: As the confidence ilevel increases, confidence interval gets wider. refer formula (b)

please upvote