Ed 602 Assignment 15

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,

Use X2 for the chi-square symbol,

Use rs for the Spearman rank-difference correlation symbol, rS.

After you have filled in all of your answers click on the Submit button at the bottom of the page. Your responses will be evaluated by your instructor and the results sent back to you by electronic mail.

Name:

Student ID# (or SSN):

For each of the following problems, state the null hypothesis, the alternative hypothesis, the calculated value of the statistic, the conditions under which you would reject the null hypothesis, and the decision statement.

  1. An instructor investigates the relationship between the number of minutes needed to complete an examination and the score on the examination. Using the following data, determine whether there is a significant negative relationship between these two variables.

    Times to complete examination and examination scores for 10 students
    Time
    (minutes)    		 Examination
    Score
    34 78
    46 92
    60 56
    37 82
    41 96
    54 66
    56 79
    48 85
    39 92
    50 80

    1. H0:

    2. H1:

    3. r =

    4. State conditions under which you would reject H0

    5. Indicate the decision statement for this problem:

  2. Twelve students are ranked according to their cumulative grade point average and according to their grade point average for psychology courses only. Is there a significant positive correlation between these two sets of ranks?

    Ranks on Cumulative GPA and Psychology GPA for 12 Students
    Cumulative
    GPA Rank    		 Psychology
    GPA Rank
    1 2
    2 5
    3 4
    4 1
    5 6
    6.5 3
    6.5 7.5
    8 10
    9 9
    10 12
    11.5 7.5
    11.5 11

    1. H0:

    2. H1:

    3. rS =

    4. State conditions under which you would reject H0

    5. Indicate the decision statement for this problem:

After answering all questions, press .

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Last modified: Tue Aug 16, 2005