HP F2229AA HP 50g_user's manual_English_HDPSG49AEM8.pdf - Page 163
population if a sample of 60 elements indicate that the mean value of the, x = 23.3
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4. Z-INT: p1− p2.: Confidence interval for the difference of two proportions, p1-p2, for large samples with unknown population variances. 5. T-INT: 1 µ.: Single sample confidence interval for the population mean, µ, for small samples with unknown population variance. 6. T-INT: µ1−µ2.: Confidence interval for the difference of the population means, µ1- µ2, for small samples with unknown population variances. Example 1 - Determine the centered confidence interval for the mean of a population if a sample of 60 elements indicate that the mean value of the sample is ⎯x = 23.3, and its standard deviation is s = 5.2. Use α = 0.05. The confidence level is C = 1-α = 0.95. Select case 1 from the menu shown above by pressing @@@OK@@@. Enter the values required in the input form as shown: Press @HELP to obtain a screen explaining the meaning of the confidence interval in terms of random numbers generated by a calculator. To scroll down the resulting screen use the down-arrow key ˜. Press @@@OK@@@ when done with the help screen. This will return you to the screen shown above. To calculate the confidence interval, press @@@OK@@@. The result shown in the calculator is: Press @GRAPH to see a graphical display of the confidence interval information: Page 16-8