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one-tailed or two-tailed test?                    H0:                        HA: alpha: z value= σM = test statistic: z-score= Decision:

one-tailed or two-tailed test?                    H0:                        HA: alpha: z value= σM = test statistic: z-score= Decision:

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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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 μ= 35 and a standard deviation of σ= 15. Do students taking the supplement have significantly better memory scores?  α= .05. 

  1. one-tailed or two-tailed test?                
  2.    H0:

                       HA:

  1. alpha: z value=
  2. σM =
  3. test statistic: z-score=
  4. Decision:

 

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