Question 1181977
Ho: mean is 22.7 min
Ha: mean is not 22.7 min
alpha=0.01 p{reject Ho|Ho true}
test is a t(0.995, df=19)
critical value |t| >2.861
calculation is t=(29.8-22.7)/9.8/sqrt(20). basically difference in means divided by the standard error.
=7.1*sqrt(20)/9.8
=3.24
Reject the null hypothesis and conclude that the true value is more than 22.7 minutes
p-value=0.0086