Question

• In a university, the population mean GPA is 3.0 and the standard deviation of GPAs is 0.72. I’m going to draw samples of size n=100
  • The z-score of a sample average GPA of 2.95 is -0.69444444
  • The z-score of a sample average GPA of 2.8 is ____
  • The z-score of a sample average GPA of 2.9 is ____
  • The z-score of a sample average GPA of 3.15 is ____
  • The z-score of a sample average GPA of 3.25 is ____
  • The probability of getting a sample average GPA of 2.95 or less is 24.37%
  • The probability of getting a sample average GPA of 2.9 or less is _____
  • The probability of getting a sample average GPA of 2.8 or less is _____
  • The probability of getting a sample average GPA of 3.15 or more is _____
  • The probability of getting a sample average GPA of 3.25 or more is _____
  • The probability of getting a sample average GPA between 2.9 and 3.15 is _____
  • The probability of getting a sample average GPA between 2.8 and 3.25 is _____
• What’s the rule of thumb for the sample size to be “large?

Answer 1