Imagine You Are Estimating the Difference Between Two Population Means

question 10

Multiple Choice

Imagine you are estimating the difference between two population means by comparing 95% confidence intervals. If you use the 2SE rule of thumb and have desired margin of error of 5 cm, what is the approximate minimum sample size for each of the samples if the population standard deviation is 15 cm?

• A) n = 108
• B) n = 120
• C) n = 132
• D) n = 144

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