Answers
a) The test statistic here calculated is Z statistics because the distribution is normal and sample size is greater than 30.
X is the sample mean and sigma is the standard deviation
Z by formula calculated as
-1.04
b)The p value associated with the calculated Z score computed using Z table shown below.
As 0.2983
C) since the |Z| is less than Z critical and P vakuevis greater than alpha as 0.2983 hence we cannot conclude that mean is different.
d) Using 0.05 as level of significance the critical value of Z is 1.96
Rejection rule:
Reject Ho if Z is lower than the lower critical value and is greater than the upper critical value .
No, we cannot conclude that population mean is not equal to 15
Please find Z table
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