Ed 602 Assignment 10

Enter your name and student ID# is 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 mu for the population mean symbol, .

Use H0 for the null hypothesis symbol, H0.

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 recieve 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 research problems, complete the process for testing statistical hypotheses for a research problem by filling in the spaces provided for answers. Where calculations are required just provide the answer, you do not have to show your work.

  1. Based on previous experience, a clinical psychologist knows that it requires an average of 12.6 sessions, with a standard deviation of 2.75 sessions, for clients with a particular phobia to show substantial improvement. The psychologist decides to try a new form of therapy with the next five clients who present the phobia. The psychologist finds that the average number of sessions needed for this sample to show improvement is 11.9. Is this result significantly lower than the population value?

    1. H0:

      H1:

    2. alpha =

    3. Z =

    4. State the rule for rejecting the null hypothesis:

    5. Decision:

    6. Statement of results:

  2. The average number of bar presses per minute for a rat being reinforced with one pellet of food is 38. Twenty rats are trained to press a bar and are then reinforced with three pellets of food per bar press. The average number of bar presses per minute for this sample is 41, with a standard deviation of 2.60. Did the increase in reinforcement magnitude lead to a significant increase in the bar-pressing rate of the rats?

    1. H0:

      H1:

    2. alpha =

    3. t =

      df =

    4. State the rule for rejecting the null hypothesis:

    5. Decision:

    6. Statement of results:

After answering all questions, press .

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John Wasson
Last modified: Tue Aug 16, 2005