Stat 250, Section 003, Homework Assignment 4 (Due 2/24/99 in class)

• 1) Please work on the following textbook exercises in Moore: (6 points)
  • Exercise 1.44, 1.46, 1.48
  
  
• 2) Answer questions 1.49 and 1.50 in Moore using the table in the textbook. Then check your results using the Web at http://www.ruf.rice.edu/~lane/hyperstat/z_table.html
  
  Given that you have access to the Web at all times, which method (use of the table or the Web application) do you prefer, e.g., which is easier to use. Explain. (6 points)
  
  
• 3) In Quiz 1 we did not calculate the variance of the magazine circulation of the "Weider" empire. Assume the "Weider" group only possesses these 10 magazines. Calculate the variance using our shortcut formula and make a clear statement whether you are calculating a population or a sample variance. (Hint: It might be useful to know that 1.1 million can be expressed as 1.1E06, 450,000 as 0.45E06, etc.) (5 points)
  
  
• 4) (3 points)