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Unformatted text preview: Exam 2 Summer C 2008 U number_________________________ Psych Stats Summer C 2008 Brannick Exam 2 Instructions: Write your name, U number, and section number on the scantron; bubble them in. Answer any 75 of 80 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 80, 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 (test booklet); turn in the scantron. Handy formulas: SD X X z = N X X ∑ = 2 1 2 1 2 2 X X X X S S S + = 1 ) ( 2 2 = ∑ N X X s X 1 ) ( 2 = ∑ N X X s X X obt s X t μ = t X X S X X = 1 2 1 2 D S D t μ = X z X CI σ 05 . % 95 ± = X s t X CI 05 . % 95 ± = N s s X X 2 = ; 1 ) ( 2 2 = ∑ N X X s X N X X σ σ = 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 = μ D S D t μ = 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 + = ˆ ∑ = 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 = N1; df w = Nk; df b = k1 A W N MS q HSD α = W B obt MS MS F = Critical values of t , alpha = .05, twotails 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 50 2.01 100 1.98 1 Exam 2 Summer C 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 2 Summer C 2008 Chapter 8 Hypothesis Testing Using the OneSample tTest Records for six college students indicate the frequency of their visits to a clinic over the past twelve months. Their scores (number of visits) are shown below. X M D D*D 2 75 25 4 73 9 6 71 1 8 7 1 1 10 7 3 9 12 7 5 25 Sum 42 42 70 Mean 7 7 11.66667 Sum/(N1) 8.4 8.4 14 SEM 1.527525 2*SEM 3.05505 1.What is the sample mean for the participants? a. b. 7 c. 11.67 d. 14 2.What is estimated population variance of the scores? a. 1.53 b. 11.67 c. 14 d. 42 3.What is the standard error of the mean for this study? a. 1.53 b. 3.06 c. 11.67 d. 14 4.If the hypothesized population mean is 5.5 for all clinic users, what is the approximate z score for the sample mean? a. b. 1 c. 2 d. 3 3 Exam 2 Summer C 2008 5.If 5 . 5 : = μ H and 5 . 5 : ≠ μ a H , what is the critical value of t ? a. 1.65 b. 1.96 c. 2.45 d. 2.57 6. 5 . 5 : = μ H and 5 . 5 : ≠ μ a H , what is the approximate obtained value of t? a. b. 1 c. 2 d. 3 7. Results of this t test indicate that we should: a. Fail to reject the null; college student visit the more than average b. Fail to reject the null; college students are average in their number of visits c. Reject the null; college students are average in their number visits d. Reject the null; college students visit the clinic more than the average...
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This note was uploaded on 05/21/2011 for the course PSY 3204 taught by Professor Brannick during the Spring '10 term at University of South Florida.
 Spring '10
 Brannick

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