Behavioral Science

CHAPTER 27
Biostatistics
STATISTICAL DISTRIBUTION
What are the three measures of central
tendency?
What is the definition of mean?
What is the definition of median?
What is the definition of mode?
1. Mean
2. Median
3. Mode
The average of a set of numbers
The middle number in a set of numbers
when they are put in sequential order
Note: If there is an even amount of
data in a set, the median is the
average of the two middle values
in the data set.
The number that appears most
frequently in a set of numbers.
Using the following set of numbers, Mean = [(1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 +
what are the mean, median, and mode? 9 + 10 + 11 + 12 + 12)/13] = 90/13 = 6.923
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 12 Median = 7
Mode = 12
What is the range of a data set?
Define normal distribution.
What type of curve demonstrates
a normal distribution?
The difference between the highest and
lowest values in a data set
Note: The range in the data set above is
12 − 1 = 11.
A set of numbers in which the mean,
median, and mode are equal.
Mean = median = mode
Gaussian or bell-shaped curve
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