A researcher is testing the effectiveness of a new herbal supplement that claims to improve memory performance. A sample of n=25 college students is obtained and each student takes the supplement daily for 6 weeks. At the end of the 6 weeks, each student is given a standard memory test, and the average score for the sample is M=39. For the general population of college students, the distribution of test scores is normal with a mean of = 35 and a standard deviation of = 15. Do students taking the supplement have significantly better memory scores?  αα= .05.                   a. one-tailed or two-tailed test?                   b.    H0:                        HA:                  c. alpha: z value=                  d. σM =                  e. test statistic: z-score=                  f. Decision:

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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A researcher is testing the effectiveness of a new herbal supplement that claims to improve memory performance. A sample of n=25 college students is obtained and each student takes the supplement daily for 6 weeks. At the end of the 6 weeks, each student is given a standard memory test, and the average score for the sample is M=39. For the general population of college students, the distribution of test scores is normal with a mean of = 35 and a standard deviation of = 15. Do students taking the supplement have significantly better memory scores?  αα= .05. 

                 a. one-tailed or two-tailed test?   

               b.    H0:

                       HA:

                 c. alpha: z value=

                 d. σM =

                 e. test statistic: z-score=

                 f. Decision:



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