A researcher claims that the standard deviation of the life of a certain type of lawn mower

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A researcher claims that the standard deviation of the life of a certain type of lawn mower is at most 2.8 years.
Determine whether the claim represents the null hypothesis or the alternative hypothesis. If a hypothesis test is performed, how should you interpret a decision that
(a) Rejects the null hypothesis?
(b) Fails to reject the null hypothesis?
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