espin086 / espin086/Experiments
Create Confidence Interval
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Description
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Situation 1: Create A Confidence Interval
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You have completed a test mailing and obtained a response rate. | | |
What is the confidence interval? | | |
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Test Mailing | | Enter Data |
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Proportion Response: | | 0.5 |
Confidence Level: (80%,85%,90%,95%) | | 0.9 |
Sample Size: | | 223000 |
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This is a Two Sided Test | | |
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The Expected Response Rate is Between: | =+E39 | And | =+E38
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Work Area
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Percent Response | P= | =+E13 |
Sample Size | N= | =+E15 |
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Standard Error = se = sqrt{P*(1-P)/N} | SE | =SQRT(E13*(1-E13)/E15) |
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Critical Point | a= | =ABS(NORMSINV((1-E14)/2)) |
Confidence Interval =P +/-a*SE | a*SE | =+E36*E34 |
| P+a*SE | =+E31+E37 |
| P-a*SE | =+E31-E37 |
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USAA Classification: Internal
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