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1. What is the mean of a data set?
a) The most frequent value in the data set
b) The middle value of the data set when it is sorted
c) The sum of all the values in the data set divided by the
number of values
d) The difference between the largest and smallest values
in the data set
Answer: c) The mean is the average of the data set and it is
calculated by adding all the values and dividing by the
number of values. The mean is a measure of central
tendency that indicates the typical value of the data set.
Rationale: The mean is one of the basic data descriptors
that summarizes the data set with a single number. It is
useful for comparing different data sets or finding trends
over time.
2. What is the median of a data set?
a) The most frequent value in the data set
b) The middle value of the data set when it is sorted
c) The sum of all the values in the data set divided by the
number of values
d) The difference between the largest and smallest values
in the data set
Answer: b) The median is the middle value of the data set
when it is sorted in ascending or descending order. If there
are an even number of values, the median is the average of
the middle two values. The median is another measure of
central tendency that indicates the middle point of the data
distribution.
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