11. Identifying the critical region for a one-tailed test Aa Aa There is a sexua

Question

11. Identifying the critical region for a one-tailed test Aa Aa There is a sexually dimorphic nucleus (SDN) in the preoptic area of the hypothalamus of many mammals that is associated with the expression of male sexual behavior. In sheep, the SDN has two to three times more neurons in rams than in ewes. Suppose you are a researcher who is interested in whether the hormone testosterone will increase the number of neurons in the female SDN. You obtain a random sample of n 225 sheep and give each a testosterone injection. The number of neurons in the SDN of an untreated adult ewe is normally distributed with a mean Untreated-101 and a standard deviation = 15, You identify your null and alternative hypotheses as follows: Ho: treated 101, H d> 101 Use the Distributions tool to help you answer the questions that follow

Explanation / Answer

here std error of mean =std deviation/(n)1/2 =15/(225)1/2 =1

for right tailed test at 0.05 level; z =1.65

therfore rejection region = mean + z*std error =102.65

hence option 102.65 is correct

therefore you do not reject   the null hypothesis and can not infer that ..........

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