exam3Sp08 - Exam 3 Spring 2008...

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Unformatted text preview: Exam 3 Spring 2008 Name_________________________ Psych Stats Spring 2008 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 Spring 2008 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 Spring 2008 Chapter 9 Two-Sample t-Test 1.We want to know if husbands or wives are more satisfied with their marriage, so we ask married couples (husband and wife separately) to complete an anonymous satisfaction survey. The data should be analyzed using a _______ t-test. a. Independent b. Paired (dependent) c. Participant d. Two-sample 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, what percent of the time will t obt take on a positive value? a. 0 b. 5 c. 50 d. 95 4. If we have two groups with means 1 and 2 and the null hypothesis is true and alpha is .05, what percent of the time will t obt be greater than t crit ? a. b. 5 c. 50 d. 95 5.An investigator examines the influence of a new vitamin on fingernail strength, testing a group of volunteers both before and 3 months after a daily regimen of vitamins. What kind of test should we use? a. ANOVA b. Independent samples t c. Paired (dependent) samples t d. Single sample t 3 Exam 3 Spring 2008 6.Suppose we have males and females in college classes rate the persuasiveness of a speech given by a dietician. We want to know if there is any difference between males and females in perceived dietician persuasiveness. What formula would we use?...
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exam3Sp08 - Exam 3 Spring 2008...

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