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5. T-INT: 1 .: Single sample confidence interval for the population mean, ,
for small samples with unknown population variance.
6. T-INT:
.: Confidence interval for the difference of the population
means,
-
, for small samples with unknown population variances.
1
2
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
The confidence level is C = 1- = 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@@@.
calculator is:
Press @GRAPH to see a graphical display of the confidence interval information:
= 0.05.
The result shown in the
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