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In: Statistics and Probability

Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory.  To test...

Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory.  To test this claim, a researcher selects a sample of n = 25 college students.  Each student is given a ginkgo biloba supplement daily for six weeks and then all the participants are given a standardized memory test.  Scores on the test are normally distributed with μ = 70 and σ = 15.  The sample of n = 25 students had a mean score of M = 75.  Is this sample sufficient to conclude that the herb has a significant effect on memory?  Use a two-tailed test with α = .05.

  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

Solutions

Expert Solution

orchestra answered 1 year ago
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