Question

When finding the margin of error for the mean of a normally distributed population from a sample, what is the critical probability, assuming a confidence level of 86%?
a.0.14
b.0.86
c.0.93
d.0.99

Answer 1

I believe you find the z score here

Answer 2

how do i do that

Answer 3

i really need help plz help me

Answer 4

@owen3 He doesn't know z-scores, normal distributions, or percentiles.

Answer 5

critical probability = 1 - alpha/2

Answer 6

which means?

Answer 7

is the answer a?

Answer 8

alpha = 1 - Confidence Level
therefore
alpha = 1- .86 = .14
alpha/2 = .14/2 = ,07

critical probability = 1- alpha/2 = 1- .07 =

Answer 9

so the answer is a?

Answer 10

are we allowed to give answers?

Answer 11

yes

Answer 12

yes that is the answer

Answer 13

ok thank you