Question
Confidence level Critical value 0.90 z=1.645 0.95 z=1.960 0.99 z=2.576 Jump to level 1 A poll reported 70% support for a statewide election with a
| Confidence level | Critical value |
|---|---|
0.90 | z=1.645 |
0.95 | z=1.960 |
0.99 | z=2.576 |
Jump to level 1
A poll reported 70% support for a statewide election with a margin of error of 3.5 percentage points. How many voters should be sampled for a 90% confidence interval? Round up to the nearest whole number.
voters:
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Elementary Algebra Concepts & Applications
Authors: Marvin L Bittinger, David J Ellenbogen, Barbara L Johnson
9th Edition
0321877926, 9780321877925
