Data on the blood cholesterol levels of 24 rats (in milligrams per deciliter) gi
ID: 2946256 • Letter: D
Question
Data on the blood cholesterol levels of 24 rats (in milligrams per deciliter) give x? = 85 and s = 12.
Which of the following would be most worrisome for the validity of a 95% confidence interval?
Not knowing the population standard deviation ?.
The sample size is less than 40.
The presence of a clear outlier in the raw data.
A mild skew in the stemplot of the raw data.
A.Not knowing the population standard deviation ?.
B.The sample size is less than 40.
C.The presence of a clear outlier in the raw data.
D.A mild skew in the stemplot of the raw data.
Explanation / Answer
Option (D): A mild skew in the stemplot of the raw data, socce construction of confidence interval is based upon the assumption that the data points follow normal distribution approximately which contradicts the presence of skewness in the data.
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