Download Chapter 4 – Measures of Central Tendency and Variability

Chapter 4 – Measures of Central Tendency and Variability
Know and be able to do
1. You should be able to define the terms in the Important Terms section of this chapter.
2. You should understand conceptually the following:
a. Arithmetic mean
b. Overall mean
c. Median
d. Mode
e. Range
f. Deviation score
g. Sum of Squares
h. Standard Deviation
i. Variance
3. You should be able to compute the following:
a. Arithmetic mean
b. Overall mean
c. Median (from raw scores were N is even or odd, and from grouped frequency
distributions
d. Mode (from a set of raw scores)
e. Range (from a set of raw scores)
f. Deviation score
g. Sum of Squares (by two methods)
h. Standard Deviation (by two methods)
i. Variance
4. You should know and understand the three properties of the mean.
5. You should know and understand the two properties of the median.
6. You should understand how the mean, median, and mode are affected by skew and
symmetry in unimodal distributions.
7. You should know how the standard deviation of a sample as computed in your
textbook differs from the standard deviation of a population.
8. You should understand and be able to solve the illustrative examples and practice
problems of this chapter.