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Midterm 2 - Version B

Midterm 2 - Version B - PSYCHOLOGY60 SPRING,2010 MIDTERM2...

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P SYCHOLOGY 60 S PRING , 2010 MIDTERM 2 Tuesday, May 18th, 2010 FULL NAME ___________________________________________________________________________________ STUDENT ID __________________________________________________________________________________ Please put your name and ID number on this page AND on the Scantron form. VERSION B
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Psychology 60 – Spring, 2010 – Midterm 2 – Given 5/18/2010 2 This page is intentionally blank.
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Psychology 60 – Spring, 2010 – Midterm 2 – Given 5/18/2010 3 1. For a repeated‐measures/dependent‐samples test, the null hypothesis states: a) μ 1 = μ 2 b) μ 1 μ 2 = 0 c) μ D μ = 0 d) μ D = 0 e) μ D = X D 2. Which of the following will increase the power of a statistical test? 3. Which of the following accurately defines a Type II error? 4. Which of the following pairs is equivalent to Alpha (α) and Beta (β), respectively? 5. The distribution of sample means: a) Is always normally distributed b) Is normally distributed only if the population is normally distributed c) Is normally distributed only if the sample is normally distributed d) Is normally distributed only if the sample size is greater than about 35 e) None of the above are true 6. Which of the following will affect Cohen’s d?
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For the following five questions, assume that a researcher is interested in finding out what substances can affect exam scores. For this experiment, the researcher is specifically interested in whether eating ice cream before an exam changes students’ statistics exam scores. He knows that the average score for students on a particular exam is 83%. He gives ice cream cones to 16 randomly selected students before the exam and finds that his sample has a mean of 86% and standard deviation of 5%. 7. Which hypothesis test should the researcher perform?
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