Sharp EL9900C EL-9900C - Page 183

Chapter 10: Statistics & Regression Calculations 10 Ztest1prop Tests the success probability P0 of a population. Example A coin was tossed 100 times and landed head side up 42 times. Normally, the probability of head facing up is 0.5. Test to see if the coin is fair. 1. Press S E 1 0. The parameter input screen will appear. • prop is the hypothesis probability. The test will be conducted using hypothesis prop ≠ P0. • x is the number of successes observed and n is the number of trials (where n is a positive integer.) 2. Enter the appropriate value into each field. 3. Press @ h. p^: Success probability obtained from the sample data. 11 Ztest2prop Executes a comparative test for two success probabilities, (P1, P ). 2 Example Test the equality of P1 and P2 given the sample data n1 = 50, x1 = 16 and n2 = 20, x2 = 5, where the hypothesis is P1 < P2. 1. Press S E 1 1. The parameter input screen will appear. 2. Enter the appropriate value into each field. 173