The charitable foundation for a large metropolitan hospital isconducting a study to characterize its donor base. In the past,most donations have come from relatively wealthy individuals; theaverage annual donor income in the most recent survey was right at$100,000. The foundation believes the average has now increased. Arandom sample of 200 current donors showed a mean annual income of$103,157 and a standard deviation of $27,498. To perform this studywe should form a null hypothesis stating that the average is.__________(A. less than. B. less than or equal to. C. equal to. D.greater than. E. greater than or equal to).
At the 10% significant level, the p-value/statistics is ________(keep to 3 decimal points), so we should ____________ (A. Reject.B. Not reject) the null hypothesis.
Hence, we may conclude that the average ________ (A.. Has. B.Has not) increased and the probability that our conclusion iscorrect is at least ________ percent.
