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Chapter 8: Q 84. (page 544)

Scientists collect data on the blood cholesterol levels (milligrams per deciliter of blood) of a random sample of 24laboratory rats. A 95%confidence interval for the mean blood cholesterol level 渭is 80.2to 89.8. Which of the following would cause the most worry about the validity of this interval?

a. There is a clear outlier in the data.

b. A stem plot of the data shows a mild right skew.

c. You do not know the population standard deviation 蟽.

d. The population distribution is not exactly Normal.

e. None of these are a problem when using a t interval.

Short Answer

Expert verified

Option (a) is correct.

Step by step solution

01

Given Information

It is given that sample of 24blood cholesterol levels is taken.

02

Explanation

Strong outliers and strong skewness is the problem for using tprocedures.

Assuming 蟽as standard deviation in tprocedure.

Most suitable option is (a) for not worrying about validity of interval. Clear outlier in data is there.

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