Sharp EL9900C EL-9900C - Page 185
Zint2samp, Example, Zint1prop
UPC - 074000016873
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Chapter 10: Statistics & Regression Calculations 13 Zint2samp Finds the confidence bound of two sample means µ1 and µ2. Example Find the confidence interval of_µ1 and µ2 of sample data with th_e confidence level of 0.9,_where_x1 = 77.3, σ1 = 3.4, n1 = 30 and x2 = 75.2, σ2 = 2.8, n2 = 20 (x1 and x2 indicate sample means of two data.) Set the input method to value input mode 1. Press # S E 1 7 E. 2. Press S E 1 3. Parameter input screen will appear. 3. Enter the appropriate value into each field. 4. Press @ h. Answers will be displayed on the screen, where the numeric value within () indicates the confidence interval of µ1 and µ2 at a confidence level of 90%. * n1 and n2 are positive integers. 14 Zint1prop Finds the confidence interval of the success probability of a population from the success probability obtained from sample data collected from 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. Find the confidence interval of the success probability at a confidence level of 0.95. 1. Press S E 1 4. The parameter input screen will appear. 175