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April 17, 2014

Homework Help: stats

Posted by Komal on Tuesday, October 23, 2012 at 4:46pm.

A researcher hypothesizes that a new herbal supplement improves memory. A sample of n = 25 college students is obtained and each student takes the supplement daily for six weeks. At the end of the 6-week period, each student is given a standardized memory test, and the average score for the sample is M = 55. For the general population of college students, the distribution of test scores is normal with a mean of = 35 and a standard deviation of σ =10. Assume you're using a one-tailed test with alpha = .01.

1. What z-score marks the boundary for the critical region? Round your answer to the nearest tenth. Do not write anything else in the answer blank.

2. Do you reject or fail to reject the null hypothesis? Write either Reject or Fail to Reject. Write only one answer or the other, do not write anything else in the answer blank, and do not include periods or other punctuation.

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