A key difference between calculating the sample mean and the population mean is（）
A. we use and n instead of μ and N
B. we divide the sum of the observations by n – 1 instead of n
C. the sample observations are ranked and the middle value is selected as the population mean
D. there are no differences
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We would make you the following offer, subject to your telex acceptance us not later than June 30, 1998（）
A. reaches
B. being reached
C. reaching
D. reach
For a data set, the coefficient of skewness is -2.73. We conclude that（）
A. the mean is larger than the median
B. the median is larger than the mean
C. the standard deviation is a less than zero
D. something is wrong because the coefficient of skewness cannot be less than -1
Which measure of central tendency reports the value that occurs with the highest frequency（）
A. Mean
B. Median
C. Mode
D. Standard deviation
Which of the following is a correct statement about probability（）
A. Probability values range from 0 to 1, inclusive
B. Probabilities may assume negative values
C. Probabilities may be greater than 1
D. Probabilities are limited to one decimal place
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