Summary data on daily caffeine consumption for a sample of adult women is the following: n...

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Summary data on daily caffeine consumption for a sample of adult women is the following: n...

Summary data on daily caffeine consumption for a sample of adult women is the following: n = 36, = 215 mg. Assume the population is normally distributed with standard deviation is σ = 12 mg.

What sample size would you need to estimate the mean caffeine consumption within 4 milligrams with 95% confidence?

math Statistics-And-Probability

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Answer 1

Answer #1

Solution :

Z_/2 = Z_0.025 = 1.96

sample size = n = [Z_/2* $\sigma$ / E] ²

n = [1.96 * 12 / 4 ]²

n = 34.57

Sample size = n = 35

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Answer 2

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