Confidence intervals

Question 1

What is a CI?

Answer 1

Likelihood a population mean lies within certain boundaries

Question 2

Calculate lower bound

Answer 2

mean - (1.96 x SE)

Question 3

Calculate upper bound

Answer 3

mean + (1.96 x SE)

Question 4

If there are more than 30 ppts which table do you use? CI

Answer 4

Z tables

Question 5

If there are less than 30 ppts which table do you use? CI

Answer 5

T tables

Question 6

How large should a CI be?

Answer 6

Smaller is better as more informative