Ed 602 Assignment 9

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 rho for the population correlation symbol, .

After you have filled in all of your answers click on the Submit button at the bottom of the page. You will get immediate feedback in the form of repeating the answers you gave. A copy will also 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, state the null hypothesis, H0, and the alternative hypothesis, H1, in the spaces provided.

    Is my gas mileage significantly different than the population value of 28 miles per gallon for my type of car?

  1. H0:

  2. H1:

    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?

  3. H0:

  4. H1:

    A sociologist wants to determine whether there is a significant difference between the number of hours worked per week by a random sample of blue-collar workers and those worked by a random sample of white-collar managers. The sociologist randomly samples nine blue-collar workers and eight white-collar managers and asks each to indicate the average number of hours worked per week over the last 6 months.

  5. H0:

  6. H1:

    In an effort to determine the predictive validity of an employment test, an industrial psychologist samples 20 workers who had previously taken an employment screening test. In addition to the employment test score, the pychologist has access to the evaluation given by the worker's supervisor at the end of the 6-month probation period. Using these two scores, determine whether there is a significant positive correlation between the employment test score and the supervisor's evaluation score.

  7. H0:

  8. H1:

After answering all questions, press .

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John Wasson
Last modified: Tue Aug 16, 2005