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EDRM611: Applied Statistics

Homework for Statistics Lesson 9

Answer Completely.
 
Some calculations are required.
Due Wed., July 27, 2005, 10:30:00.000, EDT.
 
Due on the teacher's desk in BH114.
  1. (2 points) Suppose a large college dean wishes to check for a dramatic nondirectional change in GPA in recent years. The mean for the last five years has been established as 2.95 and the mean for a random sample of 225 recent graduates is 2.85 with a standard deviation of 0.55. Test H0: GPA=2.95 at the alpha=0.01 level. Be sure to show your steps and state your conclusions in a professional manner.

     

     

     

     

     

     

  2. (2 points) Repeat the problem above but for a random sample of 25 students so the t distribution should be used. Be sure to show your steps and state your conclusions in a professional manner.

     

     

     

     

     

     

  3. (2 points) Compute the 95% and 99% confidence intervals for the data in problem 1 above.

     

     

     

     

     

     

  4. (2 points) Compute the 95% and 99% confidence intervals for the data in problem 2 above.

     

     

     

     

     

     

  5. (2 points) Explain in your own words what statistical precision is and why the authors of the Hinkle text keeps repeating themselves regarding it (pages 208-9, 223, 229-30).

     

     

     

     

     

     

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