no prefer this particula next whole number. brand of pain killer is 2 percen

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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Question
In a random sample of 400 headache suffers, 85 prefer a particular brand of pain killer. How large a
sample is required if we want to be 99% confidence that our estimate of percentage of people with
headaches who prefer this particular brand of pain killer is within 2 percentage points? Round your
answer to the next whole number.
n:
Transcribed Image Text:In a random sample of 400 headache suffers, 85 prefer a particular brand of pain killer. How large a sample is required if we want to be 99% confidence that our estimate of percentage of people with headaches who prefer this particular brand of pain killer is within 2 percentage points? Round your answer to the next whole number. n:
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