Question 1179067
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Hi
population: µ  = 48mo    Sample(n=64): µ  = 45mo  and s = 2mo
Ho:  µ  = 48
Ha:  µ  < 48
Confidence Interval .05:  one-tailed t-test: t(df63) = |t-value|> 1.6694 Reject Ho

t-value = {{{blue (-3)/blue(2/8)}}} = -12
|-12| > 1.6694 
Reject Ho, Evidence shows mean life expectancy is < 48 months

Wish You the Best in your Studies.
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