Charmaine reads 18 chapters of a book in 6 hours .What is her rate in chapters per hour?
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Answer:
The minimum sample size required is 25 so that margin of error is no more than 3 minutes.
Step-by-step explanation:
We are given the following in the question:
Mean, μ = 42 minutes
Standard Deviation, σ = 9 minutes.
We want to build a 90% confidence interval such that margin of error is no more than 3 minutes.
Formula for margin of error:
Putting values, we get.
Thus, the minimum sample size required is 25 so that margin of error is no more than 3 minutes.