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In: Statistics and Probability

Two brands of cigarettes are selected, and their nicotine content is compared. The data is below:...

Two brands of cigarettes are selected, and their nicotine content is compared. The data is below:

Brand A: sample mean = 30.8, the sample standard deviation = 5, the sample size 37

Brand B: sample mean = 33.1, the sample standard deviation = 4, the sample size 46

A) Find the margin of error for 95% confidence interval of the true difference in the means

B) Find the lower bound of 95% confidence interval of the true difference in means (round answer 3 decimal places)

C) Find upper bound of 95% confidence interval of the true difference in means (round answer 3 decimal places)

D) Based on the 95% confidence interval calculated, can you conclude which brand has a lower nicotine level?

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orchestra answered 2 years ago
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