From the given data,
xbar = 84.26
sigam = 8.3443 , n =5
t = (xbar - mu)/(sigma/sqrt(n))
= ( 84.26 - 88.6)/(8.3443/sqrt(5))
= -1.163
p value = 0.1547
The p value is greater than alpha
fail to reject the null
There is not sufficient evidence to to support the claim that the population mean is less than 88.6
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