Find the 95% confidence interval for the p when X = 60 and n = 500.
Press STAT, then RIGHT ARROW twice to TESTS. Press A to select A:1-PropZInt.
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Enter 60 for x:. ARROW DOWN once and enter 500 for n:. ARROW DOWN once again to C-LEVEL:. Enter the confidence interval as the decimal .95. Then ARROW DOWN once more to Calculate and press ENTER. The results are shown below.
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The final screen reports not only
the confidence interval of the proportion p as (0.09152,
0.14848) in interval notation, but also 
is
also given as 0.12.
This
can also be written as 0.09152
< p < 0.14848.
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