Question

how to find confidence interval estimate

Answer 1

What information are you given?

Answer 2

you need to have your interval... you know how much confidence you want... so

1-confidence gives you alpha

alpha/2 gives you the score .... do you know sigma or not??? that determines if you want z or t scores....

Answer 3

whether it is t or z they are both similar, but you NEED to be looking in the right place.

if it is T scores you need to know your degrees of freedom which is n-1 (z scores none of that matters)

either way the interval is found by
xbar +- (z or t score alpha/2)(s/sqrt(n))

Answer 4

its hard not knowing numbers to throw in there, but thats it generally

Answer 5

are you looking for the point estimate?