Question: A school administrator claimed that the average time spent on a school bus by those students in his school district who rode school buses was

A school administrator claimed that the average time spent on a

A school administrator claimed that the average time spent on a school bus by those students in his school district who rode school buses was 35 minutes. A random sample of 20 students who did ride the school buses yielded an average of 42 minutes riding time with a standard deviation of 6.2 minutes. Does this sample of size 20 contain sufficient evidence to indicate that the mean riding time is greater than 35 minutes at the 5% level of significance? Solution: Step 1 Ho : ( >= (greater than or equal to) 35 vs. H1 : A

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1. Identify your reference point when making a decision based on an element of risk.

3. If there are reasonable alternatives, think about your decisions based on the different reference points and see if there are any contradictions in the decisions.