jiiaxuan2035

07.03.2020 • 

Mathematics

At Western University the historical mean of scholarship examination scores for freshman applications is 910. A historical population standard deviation = 165 is assumed known. Each year, the assistant dean uses a sample of applications to determine whether the mean examination score for the new freshman applications has changed.

a. State the hypotheses.

b. What is the 95% confidence interval estimate of the population mean examination score if a sample of 200 applications provided a sample mean = 935?

c. Use the confidence interval to conduct a hypothesis test. Using a = .05, can the assistant dean conclude that the mean examination score for the new freshman applications has changed?

d. What is the p-value?

Ответ:

lovenahofer

15.10.2020

Mathematics

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i think that the second is correct which is tanx = opposite ÷ adjacent

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