From a random sample of six students in an introductory finance class that uses group-learning techniques, the mean examination score was found to be 76.12 and the sample standard deviation was 2.53. For an independent random sample of nine students in another introductory finance class that does not use group learning techniques, the sample mean and standard deviation of exam scores were 74.61 and 8.61, respectively. Estimate with 95% confidence the difference between the two population mean scores; do not assume equal population variances.
Answer to relevant QuestionsPrairie Flower Cereal, Inc., is a small, but growing, producer of hot and ready-to-eat breakfast cereals. Gordon Thorson, a successful grain farmer, started the company in 1910 (Carlson 1997). Two machines are used for ...Calculate the 95% confidence interval for the difference in population proportions for each of the following: a. nx = 350 p`x = 0.64 ny = 300 p`y = 0.68 b. nx = 245 p`x = 0.45 ny = 230 p`y = 0.48 Independent random samples from two normally distributed populations give the following results: nx = 15 x-bar = 400 sx = 20 ny = 13 y-bar = 360 sy = 25 Assume that the unknown population variances are equal and find a 90% ...An agency offers students preparation courses for a graduate school admissions test. As part of an experiment to evaluate the merits of the course, 12 students were chosen and divided into six pairs in such a way that the ...Assuming equal population variances, compute the pooled sample variance s2p for part a through part c of Exercise 8.8. In exercise a. nx = 16 s2x = 30 ny = 9 s2y = 36 b. nx = 12 s2x = 30 ny = 14 s2y = 36 c. nx = 20 s2x = ...
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