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Assignment #11 Single Sample t-Test What factor determines whether you should use a z-test or a t-test statistic for a hypothesis test? A sample of n = 16 individuals is selected from a population mean of : = 74. A treatment is administered to the individuals in the sample and, after treatment, the sample variance is found to be s2 = 64. A major corporation in the Northeast noted that last year its employees averaged : = 5.8 absences during the winter season (December to February). In an attempt to reduce absences, the company offered free flu shots to all employees this year. For a sample of n = 100 people who took the shots, the average number of absences this winter was M = 3.6 with SS = 396. Do these data indicate a significant decrease in the number of absences? Use a one-tailed test with = .05. On a standardized spatial skills task, normative data reveal that people typically get : = 15 correct solutions. A psychologist tests n = 7 individuals who have brain injuries in the right cerebral hemisphere. For the following data, determine whether or not right-hemisphere damage results in significantly reduced performance on the spatial skills task. Test with alpha () set at .05 with one tail. The data are as follows: 12, 16, 9, 8, 10, 17, 10. 11.3 11.4 I. Assumptions for t-test A. Populations Single Sample t-test 1. the population from which the sample is selected is normal A. Significance level (should be given or decided prior to the research; also called the 1 confidence, alpha, or p level) 1. ? or p = .05, .01, or .001 1. df = n 1
D. With degrees of freedom & one- or two-tailed ? value, find the critical t value Purchase the answer to view it
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