EPY 8214 Exam 1 Take-Home Exam Spring 2013

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EPY 8214Exam 1 Take-home Exam Spring 2013Directions1.Exam is due in one week. Submit to the assignment dropbox by 11:59 PM onMarch 23rd,2013.Late submissions will not be accepted.2.Record your answers to all questions directly on the test.3.Please show all formulas that you use as well as your computations. You may attachadditional sheets of paper if necessary.4.Please feel free to consult your notes, the workbook (text) or any other statistical referenceexcept another person. This is not a collaborative exam.5.Read the pledge below and sign your paper belowPledgeOn my honor as a student, I have neither given or received aid on this examination_______________________________________________Signature

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1.For a sample with M = 60 and s = 6, find the value corresponding to each of thefollowing z scores.a.z = +1.50b.z =-0.50c.z = +2.00d.z =-1/3We use the following formula : z = (X–M)/s then X = M + zsa.X = 69b. X = 57c. X = 72d. X = 582.Describe what happens to the mean, the standard deviation and the shape of thedistribution when all of the scores are transformed into z scores.This is possible to transform every X value in a distribution into a corresponding z-score. The z-score distributionwill always have a mean of zero because if X = M we have z = 0. In the caseof the standard deviation, the distribution of z-scores will always have a standard deviation of 1.As far as the shape, the shape of the z-score distribution will be the same as the raw scoresdistribution.3.Which of the following will increase the power of a statistical testand why?a.Change from .05 to .01b.Change from a one-tailed test to a two-tailed testc.Change the sample size from n = 100 to n = 25d.None of the other options will increase power.4.If a treatment has a very small effect, then a hypothesis test is likely to:a.Result in a Type I errorb.Result in a Type II errorc.Correctly reject the null hypothesisd.Correctly fail to reject the null hypothesis

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