Homework Answers
##. At most means ... Less than or equal to .
So here , our claim is that standard deviation of life is at most 3.8 year. That is (sigma)≤ 3.8.
Now sigma including equality sign(=) .
## Ans:- Since the claim [contain] a statement of equality, It represent the [null hypothesis.].
## Ans(a). There is sufficient evidence to [ reject ]the claim that standard deviation of life of certain types of lawm mower is at most 3.8 year
## Ans(b) . There is [ insufficient] evidence to [reject ]the claim that standard deviation of life is at most 3.8 year.
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