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:
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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