A psychologist believes that it will take at least an hour for certain special child to learn a task. A random sample of 30 of these children results in a mean of 50 minutes to learn a task. Should the psychologist modify her belief at 0.01 level if the population standard deviation can be assumed to be 15 minutes?

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Q: Scenario 1: The mean content of 25 bottles of brand S mango juice is 255 ml with a standard…

A: Given Information: Sample size n=25 Sample mean x¯=255 Sample standard deviation s=9 Claim: On…