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Statistics - Hypothesis Test

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Proportion problem
On average an organization has received 20% positive returns on their annual request for donations, out of 220 that were mailed. This year, 18.5% positive returns out of 250 were received. The level of significance is .05. Were the returns in the second year less than the historical level.

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Solution Summary

The expert examines a hypothesis test in statistics. A Complete, Neat and Step-by-step Solution is provided in the attached file.

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1) stating the hypotheses.

H0: The returns in the second year were same as that corresponding to the historical level, that is, p2 = p1 or p2 - p1 = 0

Ha: The returns in the second year were less than that ...

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