Testing Mean with known Variance
sample size9
population variance2
sample mean5
null hypothesis about mean0
type I error0.05
critical value (one-tailed)0.77539143578445
confidence interval (two-tailed)
(sample mean)
[ 4.07606411710021 , 5.92393588289979 ]
conclusion for one-tailed test
Reject the null hypothesis.
conclusion for two-tailed test
Reject the null hypothesis