Psychology Stats and Research

Although there is a popular belief that herbal remedies such as Ginkgo biloba and Ginseng may improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research (Persson, Bringlov, Nilsson, and Nyberg, 2004). In a study, a researcher obtains a sample of n = 16 participants and has each person take the herbal supplements every day for 90 days. At the end of the 90 days, each person takes a standardized memory test. For the general population, scores from the test form a normal distribution with a mean of μ = 50 and a standard deviation of σ = 12. The sample of research participants had an average of M = 54. Using the standard 4-step procedure, conduct a two-tailed hypothesis test with a .05 level of significance, α = .05, and p = .059 to evaluate the effect of the supplements.

o Step 1: State the hypotheses. State the null hypothesis and the alternative hypothesis. Write the hypotheses using statistical notation and for each, include a statement of interpretation in plain English.
o Step 2: Set the criteria for a decision. State the level of significance, the alpha level, and whether the test is one-tailed (directional) or two-tailed (nondirectional).
o Step 3: Compute the test statistic. State the observed p value.
o Step 4: Make a decision. State whether to retain or reject the null hypothesis.

asked by Sasha
  1. We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.

    I will start you out. State with your own notations.

    Ho: no difference
    H1: difference

    Z = (mean1 - mean2)/standard error (SE) of difference between means

    SEdiff = √(SEmean1^2 + SEmean2^2)

    SEm = SD/√n

    If only one SD is provided, you can use just that to determine SEdiff.

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability of the Z score to compare to your level of significance.

    posted by PsyDAG

Respond to this Question

First Name

Your Response

Similar Questions

  1. statistic

    Although there is a popular belief that herbal remedies such as Ginkgo biloba and Ginseng may improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research (Persson, Bringlov,
  2. S+E Middle Ages

    http://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=SUNA,SUNA:2006-45,SUNA:en&q=herbal+remedies+medieval I searched for herbal remedies medieval and these are the results. I hope there's something useful in here for you.
  3. statistics

    A researcher is interested in whether herbal remedies are effective in relieving allergies, and if so, which ones are most effective. The researcher takes a group of 20 allergy sufferers and randomly assigns each one to receive
  4. History

    1.)which describes a belief of the progressive movement ? A.) the belief that government could correct ills of society B.) the belief that individual citizens could work to improve social problems C.) the belief that business and
  5. History

    1.)which describes a belief of the progressive movement ? A.) the belief that government could correct ills of society B.) the belief that idividual citizens could work to improve social problems C.) the belief that business and
  6. Social Studies

    Which describes a belief of the progressive movement? (1 point) the belief that government could correct the ills of society the belief that individual citizens could work to improve social problems the belief that business and
  7. Social Studies

    Which describes a belief of the progressive movement? (1 point) the belief that government could correct the ills of society the belief that individual citizens could work to improve social problems the belief that business and
  8. Intro to psychology / science

    Learning and memory researchers have discovered that : A.) physical exercise promotes new cell growth, while mental ecercise only maintains exsisitng cells. B.)stem cells can divide and mature throughout adulthood. C.) age is the
  9. Psychology

    This is a homework assignment for my Psychology course on Memory and learning. Find a Movie/video clip (1-3 mins)that demonstrate a concept / phenomenom relevant to learning and memory? My prof used Matrix (what we see is just our
  10. psychology

    Trace the memory system from stimuli into long-term memory. Siscuss the features of each step and factors that enhance or impede information flow in each step of the process. Explain proactive and retroactive interference and how

More Similar Questions