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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 = 23.2, and its standard deviation is s = 5.2. Use α = 0.05. The confidence level is C =
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
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:
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