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# PSYC 354 HOMEWORK 7 CONFIDENCE INTERVALS, EFFECT SIZE, AND STATISTICAL POWER

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PSYC 354HOMEWORK 7Confidence Intervals, Effect Size, and Statistical PowerWhen submitting this file, be sure the filename includes your full name, course and section.Example: HW7_JohnDoe_354B01Be sure you have reviewed this module/week’s lesson and presentations along with the practicedata analysis before proceeding to the homework exercises. Complete all analyses in SPSS, thencopy and paste your output and graphs into your homework document file. Answer any writtenquestions (such as the text-based questions or the APA Participants section) in the appropriateplace within the same file.Part I: ConceptsQuestions 1–8These questions are based on the Nolan and Heinzen reading andend-of-chapter questions.Part I: Questions 1a-1eFill in the highlighted blanks with the best word or words.1-a) The confidence interval is centered around the _mean_______ of the sample.1-b)Cohen's d measures the difference between means in terms of ___standard deviationnot standard error_____.According to Cohen's conventions, a d value of _appropriate measure of effect size1-c) for a z statistic_______ indicates a small effect.A study that calculates the mean effect size from the individual effect sizes of many1-d) studies is called a(n) __meta analysis______.Statistical power refers to the probability of successfully rejecting the _null1-e) hypothesis_______.Part I: Questions 2-5End-of-chapter problems:Complete the following problems.Page 1 of 5 PSYC 354If applicable, remember to show work in your homework document to receive partialcredit.2)List five factors that affect statistical power. For each, indicate how aresearcher can leverage/manipulate that factor to increase power in a study.A) Sample Size (increase sample size)B) )Effect Size (increase predicted difference between means/decrease population standarddeviation)C) Alpha Level (use less extreme alpha level),D) Test Direction (use a one-tailed testE) Type of Hypothesis Test Used (use more sensitive hypothesis test)3)Exercise 8.22 from N&H text: In 2006, approximately 47% of Americans,when surveyed by a Gallup poll, felt that having a gun in the home madethem safer than having no gun. The margin of error reported was 3%.Construct an interval estimate using these figures.Answer44% - 50% is our interval estimate4)For each of the following confidence levels, look up the critical z values for atwo-tailed test.4a) 80% (Hint: 10% ineach tail): Answer

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