Question

A simple random sample of size n is drawn. The sample mean, x-bar,is found to be 17.9, and the sample standard deviation, s, is found to be 4.1.

See attachment for question.

Answer 1

1) 9.7, 26,1

Answer 2

2) 16,85, 18,95

Answer 3

SE = sd/sqrt(n)

Se = 4,1/sqrt(61) = 0,53

Margin Error = 2*SE = 1,05

Answer 4

For the next one,SE = sd/sqrt(n), Then Margin Error = 2*SE
So increasing n how does addect the E? i think you understand!

Answer 5

4) If the sample size is 34

Answer 6

Se = 4,1/sqrt(34) = 0,70

Answer 7

Margin Error = 2*SE = 1,4

Answer 8

now you can see what happens if the sample size is bigger or smaller

Answer 9

16,5, 19,3

Answer 10

the last two are very clear now. Good Luck

Answer 11

THANK YOU!!!

Answer 12

@Social the confidence intervals are supposed to be to the 2 decimal places.

Answer 13

16,50, 19,30

Answer 14

what about (a)?

Answer 15

is it 9.70,26.10?