Question: A publisher is interested in the effects on sales of
A publisher is interested in the effects on sales of college texts that include more than 100 data files. The publisher plans to produce 20 texts in the business area and randomly chooses 10 to have more than 100 data files. The remaining 10 are produced with at most 100 data files. For those with more than 100, first-year sales averaged 9,254, and the sample standard deviation was 2,107. For the books with at most 100, average first-year sales were 8,167, and the sample standard deviation was 1,681. Assuming that the two population distributions are normal, test the null hypothesis that the population variances are equal against the alternative that the population variance is higher for books with more than 100 data files.
Answer to relevant QuestionsA university research team was studying the relationship between idea generation by groups with and without a moderator. For a random sample of four groups with a moderator, the mean number of ideas generated per group was ...A study was aimed at assessing the effects of group size and group characteristics on the generation of advertising concepts. To assess the influence of group size, groups of four and eight members were compared. For a ...Random samples of employees were drawn in fast-food restaurants where the employer provides a training program. Of a sample of 67 employees who had not completed high school, 11 had participated in a training program ...National education officials are concerned that there may be a large number of low-income students who are eligible for free lunches in their schools. They also believe that the percentage of students eligible for free ...Various research studies and personal lifestyle advisers argue that increased social interaction is important for a higher quality of life. You have been asked to determine if people who are single (variable single = 1) have ...
Post your question