a)
Rejection Region
This is two tailed test, for α = 0.05
b)
Critical value of z are -1.96 and 1.96.
Hence reject H0 if z < -1.96 or z > 1.96
c)
Test statistic,
z = (xbar - mu)/(sigma/sqrt(n))
z = (47 - 48)/(7/sqrt(38))
z = -0.88
d)
Rejection Region Approach
As the value of test statistic, z is within critical value range,
fail to reject the null hypothesis
A sample of 38 observations is selected from a normal population. The sample mean is 47,...
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