Question 1010696
Ho mean is 12
Ha mean is not 12.
alpha=0.01
test- statistic is a t with df=29
critical value is |t|>2.76
calculation is (11.92-12)/0.26/sqrt (30)
= -0.08*5.477/0.26=1.69
Fail to reject Ho
Not convincing evidence to assume that the machinery needs to be recalibrated or that the mean is not 12.
p-value =0.10