Testing Mean with known Variance
sample size105
population variance13
sample mean20.2857142857143
null hypothesis about mean20
type I error0.35
critical value (one-tailed)20.1355810846416
confidence interval (two-tailed)
(sample mean)
[ 19.9568643002475 , 20.6145642711811 ]
conclusion for one-tailed test
Reject the null hypothesis.
conclusion for two-tailed test
Do not reject the null hypothesis