exam4sp07 - Exam 4 Spring 2007 1 Name_ Psych Stats Spring...

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Exam 4 Spring 2007 Name_________________________ Psych Stats Spring 2007 Brannick Exam 4 Instructions: Write your name and U number on the scantron. For section, put 1 or 2 if you are in Dan’s lab; put 3 or 4 if you are in Xian’s lab. 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: 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 = 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 = - μ 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 + = 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 = N-1; df w = N-k; df b = k-1 A W N MS q HSD α = W B obt MS MS F = 1
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Exam 4 Spring 2007 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 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
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Section 1 1. A numerical summary of a population of people is called a(n) a. Correlation b. Experiment c. Parameter d. Statistic 2.A distribution is a collection of data about an attribute of interest. Such an attribute is called a __________ in research. a. constant b. control c. design d. variable 3.Descriptive and inferential statistics are both computed on a sample of data. The difference is that descriptive statistics concern only the ______, but inferential statistics also concern the ____________. a. Present population, same sample b. Present sample, population c. Simple population, complex population d. Sample of interest, other samples 4.Statisticians are concerned both with study design and data analysis. Design refers to _____, and analysis refers to ________. a. Computations, data collection b. Data collection, computations c. Data collection, reasoning d. The null hypothesis, the alternative hypothesis 5.Consider the following formula: 1 ) ( 2 2 - - = N X X s X . In the formula, what is the label or name for 2 X s ? a. Estimated population variance b. Null hypothesis c. Population standard deviation d. Standard error of the mean 6.Consider the following formula: 1 ) ( 2 2 - - = N X X s X . In the formula, what is the meaning of N ? a.
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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 - Tampa.

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exam4sp07 - Exam 4 Spring 2007 1 Name_ Psych Stats Spring...

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