Ed 602 Assignment 13

Enter your name and student ID# in the spaces below. Then provide an answer to each of the questions entered on this form. You may make the following substitutions in your answers if necessary.

Use not equal for the not equal to symbol,

Use mu1 for the group 1 mean symbol,

Use mu2 for the group 2 mean symbol,

Use H0 for the null hypothesis symbol, H0.

Use H1 for the alternative hypothesis symbol, H1.

Use <= for the less than or equal to symbol,

Use >= for the greater than or equal to symbol,

After you have filled in all of your answers click on the Submit button at the bottom of the page. You will receive confirmation that your assignment has been received. A copy will be sent to your instructor who will go over your answers and give you feedback through electronic mail.

Name:

Student ID# (or SSN):

For each of the following problems, use the Excel spreadsheet program to calculate the value of the appropriate statistic for each problem. For each problem indicate H0, H1, and the value of F. Indicate the results of the Scheffe tests (for the second problem only), if they are required. You do not have to calculate Scheffe tests for the first problem. Indicate the critical value of F (.05 level) for the problem and state the conditions under which you would reject H0 Where calculations are required just provide the answer, you do not have to show your work.

  1. An industrial psychologist is interested in evaluating four different types of training on worker productivity. Using a standard measure of productivity, the psychologist measures the productivity of a set of workers who have been trained using each one of the four procedures. Using the data below, determine whether there is a significant difference between the training methods. Larger numbers on the dependent variable indicate higher productivity.

    Productivity Scores for Four Groups of Workers Trained by Different Methods
    Group 1
    On the Job    		 Group 2
    Computer Assisted    		 Group 3
    Lecture    		 Group 4
    Videotape
    67 68 46 37
    68 62 39 46
    61 59 38 49
    62 71 47 48
    60 60 46 49
    56 66 49 53

    1. H0:

    2. H1:

    3. F =

    4. Critical Value for F =

    5. State conditions under which you would reject H0

  2. A school guidance counselor investigates the influence of different motivational devices on the academic achievement of students. The counselor arranges for one group of students to receive immediate feedback upon the completion of an English assignment. A second group of students receives feedback at the end of the day, while a third group receives feedback at the end of the week. Using the students' grades on a standardized English test, determine whether there is a significant difference between the groups. If necessary, perform Scheffe tests.

    English Test Results for Groups of Students Receiving Various Types of Feedback
    Group 1
    Immediate Feedback    		 Group 2
    Day's End Feedback    		 Group 3
    Week's End Feedback
    49 40 36
    40 37 32
    41 42 31
    46 39 39
    42 45 40
    50 39 39
    53 45 41
    51 49 38

    1. H0:

    2. H1:

    3. F =

    4. F12 =

    5. F13 =

    6. F23 =

    7. Critical Value for F =

    8. State conditions under which you would reject H0

After answering all questions, press .

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Last modified: Tue Aug 16, 2005