Ans 7721 to 2279 pts 1 36 test scores on a

This preview shows page 27 - 31 out of 39 pages.

We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Understanding Statistics in the Behavioral Sciences
The document you are viewing contains questions related to this textbook.
Chapter 4 / Exercise 11
Understanding Statistics in the Behavioral Sciences
Pagano
Expert Verified
We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Understanding Statistics in the Behavioral Sciences
The document you are viewing contains questions related to this textbook.
Chapter 4 / Exercise 11
Understanding Statistics in the Behavioral Sciences
Pagano
Expert Verified
PTS:136.Test scores on a standardized test from samples of students from two universities are given below.UAUBSample Size2841Average Test Score8482Variance64100Provide a 98% confidence interval estimate for the difference between the test scores of the two universities.
PTS:137.The following shows the monthly sales in units of six salespersons before and after a bonus plan was introduced. At 95% confidence, determine whether the bonus plan has increased sales significantly. (For the following matched samples, let the difference "d" be: d = after - before.)SalespersonSales AfterSales Before194902828439084476705798068580
0
0PTS:138.The office of records at a university has stated that the proportion of incoming female students who major in business has increased. A sample of female students taken several years ago is compared witha sample of female students this year. Results are summarized below. Has the proportion increased significantly? Test at alpha = .10.Sample SizeNo. Majoring in BusinessPrevious Sample25050Present Sample30069ANS:
PTS:139.The following information regarding the number of semester hours taken from random samples of day and evening students is provided.DayEvening1612s43n4037Develop a 95% confidence interval estimate for the difference between the mean semester hours taken by the two groups of students.
PTS:140.The following data present the number of computer units sold per day by a sample of 6 salespersons before and after a bonus plan was implemented.SalespersonBeforeAfter136275366487578698At 95% confidence, test to see if the bonus plan was effective. That is, did the bonus plan actually increase sales?
0
0PTS:141.Zip, Inc. manufactures Zip drives on two different manufacturing processes. Because the management of this company is interested in determining if process 1 takes less manufacturing time, they selected independent samples from each process. The results of the samples are shown below.Process 1Process 2Sample Size2722
Sample Mean (in minutes)1014Sample Variance1625a.State the null and alternative hypotheses.b.Determine the degrees of freedom for the t test.c.Compute the test statisticd.At 95% confidence, test to determine if there is sufficient evidence to indicate that process 1 takes a significantly shorter time to manufacture the Zip drives.ANS:
0
PTS:1

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture