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# exam2F07 - Exam 2 Fall 2007 Name Psych Stats Fall 2007...

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Unformatted text preview: Exam 2 Fall 2007 Name_________________________ Psych Stats Fall 2007 Brannick Exam 2 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: N X X σ σ = N s s X X 2 = ; 1 ) ( 2 2-- = ∑ N X X s X X X z σ μ- = X obt s X t μ- = X z X CI σ 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, 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 2 Fall 2007 Chapter 5 Standard Error of the Mean 1.The standard error of the mean is the standard deviation of what distribution? a. Deviations from the mean b. Sampling distribution of the mean c. Sampling distribution of the variance d. Z scores 2.The standard error of the mean tells the average distance from the ___ to the ____. a. Confidence interval, population mean b. Population mean, sample mean c. Population mean, z score d. Sample mean, standard deviation 3.Suppose the standard deviation of raw scores in the population is 18 and the sample size is 81. What will be the standard error of the mean? a. 2/9 b. 2 c. 18 d. 36 4.Suppose we want to estimate a population mean as accurately as we can. What should we do? a. Compute a z score b. Get a large sample c. Increase the sample variance d. Look in Wikipedia 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 Fall 2007 6.Suppose we repeatedly drew random samples of size 100 from a population and find the standard error. Suppose we draw samples of size 25 from the same population and find the standard error. We expect the standard error from the samples of size 100 to be ____ as large as the standard error from the samples of size 25. a. just as b. one half c. one quarter d. twice 7.If we subtract the mean of the sampling distribution (of means) from the mean of the raw scores, we should get________....
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exam2F07 - Exam 2 Fall 2007 Name Psych Stats Fall 2007...

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