Exam 3 with answers

Exam 3 with answers - NAME:SPIREID: PSYCH240A: EXAMTHREE...

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PSYCH 240A : EXAM THREE November 10, 2008 1. Given the following data: M = 94, μ 0 = 90, s = 10, n = 25 Calculate the t-score for this data and decide whether you should reject or accept the null hypothesis. (Cutoff Value t (24) = 2.064). a. t = 2.5, reject the null hypothesis b. t = 2.5, accept the null hypothesis c. t = 2.0, reject the null hypothesis d. t = 2.0, accept the null hypothesis 2. When estimating the population variance from a sample of scores, which of the following is an unbiased estimator of the variance? a. [ Σ (X-M) 2 / N] b. [ Σ (X-M) 2 / (N Ð 1)] c. Σ (X-M) 2 / N d. Σ (X-M) 2 / (N Ð 1) 3. What is the difference between a t-test for a single sample and a t-test for dependent means? a. In a single sample, there is one score for each subject, but for dependent means, there are 2 scores for each subject b. In a single sample, the sample mean is compared to the known population mean, but in dependent samples, the sample mean is compared to an unknown population mean. c. The test for dependent means cannot be done on a computer. d. In a single sample, there is one score for each subject, but for dependent means, there is one score for every two subjects. For the next two questions, decide whether a t-test for a single sample or a t-test for dependent means should be performed. 4. A professor wants to determine whether SAT test scores from a sample of 25 undergraduate students in her class are different from the national average (i.e. the population). The students in her class have an average SAT score of 1200, with a standard deviation of 200. The national average is 1100. She should use a. Unable to Determine b. Either test will work c. t-Test for Dependent Means
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Exam 3 with answers - NAME:SPIREID: PSYCH240A: EXAMTHREE...

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