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A researcher is testing the effectiveness of a new herbal supplement that claims to improve memory...

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 six week.  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 = 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?  

  1. State the Independent and Dependent Variables
  2. State the Null Hypothesis in words and symbols.

b State the alternative Hypothesis in words and symbols.

  1. Compute the appropriate statistic.
  2. What is the decision (Retain or Reject)
  3. State the full conclusion in words

Effect

Direction

Size of Effect

           What is the critical value if we use a one-tailed test with α = .05. Explain.

Math   Statistics-And-Probability   
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