Exam3F07 - Exam 3 Fall 2007 Name_________________________...

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Unformatted text preview: Exam 3 Fall 2007 Name_________________________ Psych Stats Fall 2007 Brannick Exam 3 Instructions: Write your name and U number on the scantron. Answer any 50 of 55 questions on the exam by bubbling in the best of the four alternatives given. For those questions you wish to omit, bubble in e. If you answer all 55, I will choose the last 5 for you, so it is in your interest to pick 5 and bubble in e. You can take the printed exam with you. Handy formulas: 2 1 2 1 2 2 X X X X S S S + =- N s s X X 2 = ; 1 ) ( 2 2-- = N X X s X pairs D pairs D D N S N SD S 2 = = t X X S X X =-- 1 2 1 2 t X S X =- D S D t - = N z z r Y X = ; X X S X X z- = X Y S S r b = ; X b Y a- = ; bX a Y + = - = 2 ) ( G i tot X X SS SS tot =SS b +SS w 2 ) ( A i w X X SS- = 2 ) ( G A g b X X N SS- = MS =SS/df; Df tot = df w +df b; df t = N-1; df w = N-k; df b = k-1 A W N MS q HSD = W B obt MS MS F = Critical values of t , alpha = .05, two-tails Df t df t 1 12.706 6 2.447 2 4.303 7 2.365 3 3.182 8 2.306 4 2.776 9 2.262 5 2.571 10 2.228 1 Exam 3 Fall 2007 Critical values of F Numerator df: df B df W 1 2 3 4 5 5 5% 1% 6.61 16.3 5.79 13.3 5.41 12.1 5.19 11.4 5.05 11.0 10 5% 1% 4.96 10.0 4.10 7.56 3.71 6.55 3.48 5.99 3.33 5.64 12 5% 1% 4.75 9.33 3.89 6.94 3.49 5.95 3.26 5.41 3.11 5.06 14 5% 1% 4.60 8.86 3.74 6.51 3.34 5.56 3.11 5.04 2.96 4.70 2 Exam 3 Fall 2007 Chapter 9 Two-Sample t-Test 1.When participants are randomly assigned to one of two groups, the samples in groups are called _______. a. Dependent b. Independent c. Paired d. Participants 2.Homogeneity of variance means _______. a. Population means for the groups are the same b. Population variances for the groups are the same c. Sample sizes for the groups are the same d. Sample variances for the groups are the same 3.If we have two groups with means 1 and 2 and the null hypothesis is true, then we ______ expect to see a value of t obt greater than t crit . a. always b. commonly c. never d. rarely 4.________ indicates the amount of influence (and importance) of the independent variable in determining dependent scores. a. Critical value b. Effect size c. F statistic d. P level 5.An investigator examines the influence of a new memory-enhancing drug on the memory of Alzheimers patients, testing a group of patients before and after administration of the drug. What kind of test should we use? a. ANOVA b. Independent samples t c. Related samples t d. Single sample t 3 Exam 3 Fall 2007 6.Suppose we have males and females in college classes rate the persuasiveness of a speech given by a female speaker. We want to know if males or females find her more persuasive. What formula would we use? a....
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Exam3F07 - Exam 3 Fall 2007 Name_________________________...

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