HP 50g User Manual page 598

When done, press @@@OK@@@. The results, as text and graph, are shown below:
Example 4 -- Determine a 90% confidence interval for the difference between
two proportions if sample 1 shows 20 successes out of 120 trials, and sample
2 shows 15 successes out of 100 trials.
Press ‚Ù—@@@OK@@@ to access the confidence interval feature in the
calculator. Press ˜˜˜@@@OK@@@ to select option 4. Z-INT: p1 – p2.. Enter
the following values:
When done, press @@@OK@@@. The results, as text and graph, are shown below:
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