A poll found that 61% of a random sample of 1002 adults said that they believe...
A poll found that 61% of a random sample of 1002 adults said that they believe in ghosts. a. Determine the margin of error for a 99% confidence interval. b. Without doing any calculations, indicate whether the margin of error is larger or smaller for a 90% confidence interval.
Homework Answers
a) For 99% confidence, z = 2.576
Hence,
Margin of error
E = 0.0397
b) For 90% confidence, z critical value will be lesser as compared to 99% confidence interval and hence, margin of error would be smaller for 90% confidence interval.
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