exam4Sp10 - Exam 4 Spring 2010 U...

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Unformatted text preview: Exam 4 Spring 2010 U number_________________________ Psych Stats Spring 2010 Brannick Exam 4 Instructions: Write your name, U number, and section 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 keep the questions, but turn in the scantron. Handy formulas: N X X = ; X s X X z- = A=(z*100)+500 T=(z*10)+50 z=(A-500)/100 z=(T-50)/10 A=10T 2 1 2 1 2 2 X X X X S S S + =- ; N s s X X 2 = 2 2 2 1 2 1 2 1 N S N S S X X X X + =- 1 ) ( 2 2-- = N X X s X ; 1 ) ( 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 = 1 Exam 4 Spring 2010 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 2.228 100 1.98 Tabled values of z, the unit normal. Z Between mean and z Beyond z Z Between mean and z Beyond z 0.00 0.0 50.00 0.90 31.5 18.41 0.10 3.98 46.02 1.00 34.13 15.87 0.20 7.93 42.07 1.10 36.43 13.57 0.30 11.79 38.21 1.20 38.49 11.51 0.40 15.54 34.46 1.30 40.32 09.68 0.50 19.15 30.85 1.40 41.92 08.08 0.60 22.57 27.43 1.50 43.32 06.68 0.70 25.80 24.20 1.60 44.52 05.48 0.80 28.81 21.19 1.65 45.00 05.00 1.70 45.54 04.46 1.96 97.50 02.50 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 4 Spring 2010 Chapter 1 Introduction to Statistics and Research 1.An epidemiologist wants to know whether Nasonex (mometasone furoate monohydrate, you know, that Bee with the Spanish accent on TV) helps to reduce allergy symptoms. The researcher finds 40 people suffering allergic reactions to tree pollen and randomly assigns 20 to get Nasonex, and 20 to get a placebo. Each person gets a daily dose of their groups drug. A week later, everyone comes to the clinic and is observed for evidence of sneezing, sniffling, etc. The researcher will see whether one group suffers more than the other on average. In this study, the independent variable is ___________. a. allergy symptoms b. the drug c. the people d. time of treatment 2. In the Nasonex study, the sample is ________ a. All allergy sufferers b. The 20 people who got Nasonex c. The 20 people who got the placebo d. The 40 people in the study 3.In the Nasonex study, the population is ______ a. All allergy sufferers b. The 20 people who got Nasonex...
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exam4Sp10 - Exam 4 Spring 2010 U...

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