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Unformatted text preview: Exam 2 Spring 2007 Name_________________________ Psych Stats Spring 2007 Brannick Exam 2 Instructions: Write your name and U number on the scantron. For section, put 1 or 2 if you are in Dans lab; put 3 or 4 if you are in Xians lab. Answer any 45 of 50 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 50, 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 = N s s X X 2 = ; 1 ) ( 2 2 = N X X s X X X z  = X obt s X t  = X z X CI 05 . % 95 = X s t X CI 05 . % 95 = SD X X z = N X X = 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 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 1 Exam 2 Spring 2007 Chapter 5 Standard Error of the Mean 1.A sampling distribution is a distribution of ________? a. Parameters b. Samples c. Statistics d. Variables 2.What is the standard error of the mean? a. The average distance of the estimate to the parameter b. The rule relating sample size to quality of the mean estimate c. The sample size required to estimate the mean d. The standard deviation in the sample used to estimate the mean 3.Suppose the standard deviation of raw scores in the population is 10 and the sample size is 100. What will be the standard error of the mean? a. 1 b. 10 c. 100 d. 1000 4.When we estimate a population mean, the most important determinants of the accuracy of the estimate are the population ____ and the sample ____. a. mean, median b. mean, variance c. standard deviation, mean d. standard deviation, size 5.In the figure shown below, which letter is closest to the mean? a. A b. B c. C d. D 82 80 78 76 74 72 70 68 66 64 62 60 58 56 54 52 50 Heignt in Inches 0.80 0.64 0.48 0.32 0.16 0.00 Relative Frequency RAW DATA Height of USF Students A B C D 2 Exam 2 Spring 2007 6.Suppose we repeatedly drew random samples of size 100 from the population of height shown above and computed a mean for each sample. The distribution of sample means that resulted would have a standard deviation this is _______ the one in the figure. a. equal to b. greater than c. smaller than d. unrelated to 7.Because of the central limit theorem, we know that if we draw large samples from a population, the sampling distribution of means will be approximately________....
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 Spring '10
 Brannick

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