Question

The charitable foundation for a large metropolitan hospital is conducting a study to characterize its donor base. In the past, most donations have come from relatively wealthy individuals; the average annual donor income in the most recent survey was right at $100,000. The foundation believes the average has now increased. A random sample of 200 current donors showed a mean annual income of $103,157 and a standard deviation of $227,498. To perform this study we 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 is correct is at least percent.

          The charitable foundation for a large metropolitan hospital is
conducting a study to characterize its donor base. In the past,
most donations have come from relatively wealthy individuals; the
average annual donor income in the most recent survey was right at
$100,000. The foundation believes the average has now increased. A
random sample of 200 current donors showed a mean annual income of
$103,157 and a standard deviation of $227,498. To perform this
study we 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 is
correct is at least ________ percent.

Added by Nathan S.

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