Sol:
vs
We have here,
sample mean = 8.1 pounds/square inch
Sample standard deviation =0.9,
Sample size = 26
Degree of freedom =n-1 = 26-1 = 25
t critical value is 1.708 .........................by using t table.
Decision rule : Reject H0, if t calculated value > t critical value (1.708)
=1.70
Therefore, t calculated value < t critical value.
We fail to reject H0.
Decision rule :
Reject H0, if t calculated value > t critical value (1.708)
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