A random sample of 200 books purchased at a local bookstore showed that 72 of the books were murder mysteries. Let 푝be the true
1 answer:
Answer:
Step-by-step explanation:
Given that a random sample of 200 books purchased at a local bookstore showed that 72 of the books were murder mysteries.
Sample proportion p follows the following characteristics
p 0.36
q 0.64
pq/n 0.001152
Std dev 0.033941125
For 95% confidence level we have critical value as
Z critical = 1.96
Hence margin of error = 1.96*std dev
Confidence interval = (sample proportion - margin of error, sample proportion + margin of error)
=
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1 1/4= 1.25
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