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Let be the population mean tail length of the squirrels, in cm
For to be not rejected at 5% level of significance,
Thus the set of values is
If , will be rejected from results in (ii). There is sufficient evidence at 5% level of significance to conclude that the squirrels on the island do not have the same tail length as the species known.
Students need to be careful to leave the answers in set notation since the question requests for a set of values. (iii) requires them to answers in the question’s context.