Use the Normal Density Curve applet for Exercise 92.

Question 8.92

92. Use the applet to find critical values for unusual confidence levels. Select 2-Tail, and click and drag the flags so that the central area, not the tail area, is highlighted. Verify that the critical value for 95% confidence is 1.96.

Use the applet to find critical values for the following confidence levels:

  1. 80%
  2. 85%
  3. 98%