Which of the following is a possible reason for an outlier in a data set?
a. The individual in question belongs to a different group than the bulk of individuals measured.
b. The outlier is a legitimate data value and represents natural variability for the group and variables measured.
c. All of these answers are possible reasons for an outlier.
d. A mistake was made while taking a measurement or entering it into the computer.
Question 2
Which of the following is a popular distribution, especially when a right-skewed distribution of a nonnegative quantity is desired?
a. t-distribution
b. chi-square distribution
c. gamma distribution
d. normal distribution
e. all of these choices
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