Sample mean computed on a sample size of 64 in a statistical test is 20. Given a confidence level of 95% and a known variance of 4, the confidence intervals are:
OPTIONS
- 19,21
- 18,22
- 19.5,20.5
- 18.5,21.5
ANSWER
19.5,20.5
EXPLANATION
Using confidence intervals formula, 19.5,20.5 is correct.
