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.

  1. 👍 0
  2. 👎 0
  3. 👁 221
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.

    1. 👍 0
    2. 👎 0
    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,

    asked by andy on June 24, 2017
  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.

    asked by Writeacher on November 8, 2006
  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

    asked by Sue on May 4, 2014
  4. Reading

    Herbs have been an integral part of our diet and pharmacy since humans began roaming the Earth. Dog owners can apply the results of using herbal nutrition and medicine for the dogs they love. To keep your dog healthy, use herbs to

    asked by Lili on May 10, 2019
  5. chemistry

    Which statement is the best example of pseudoscience? Mike joined a group that studies phrenology. C.J. joined a group that studies endangered species. Katarina joined a group that studies herbal remedies. Lee joined a group that

    asked by samantha on February 10, 2013
  6. Social studies

    Which of the following is a key idea of transcendentalismo? Belief in human reason Belief in personal insights Belief in expansion of the country •• Belief in isolation from other nations

    asked by Kayla on November 28, 2016
  7. history

    Which belief defines Christianity as a religion separate from Judaism? A. ****** belief in one god B. belief in multiple gods C. study of the Hebrew Bible D. belief in Jesus as the savior**** it can only be one answer and i don't

    asked by Mel❤nie on January 7, 2019
  8. History

    @damon @Ms. Sue ..... I'm not sure if this tags you or not, but please help! Which belief defines Christianity as a religion separate from Judaism? A. belief in one god B. belief in multiple gods C. study of the Hebrew Bible D.

    asked by Anonymous on September 30, 2018
  9. 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

    asked by Sammy on March 7, 2016
  10. 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

    asked by Sammy on March 8, 2016

More Similar Questions