13. Variability refers to the degree to which scores in a set of scores vary from
one another (T/F)?
14. In Question 6, the range would be?
15. The range can be very misleading, especially when there are extreme
scores (outliers) (T/F)?
16. By definition, the interquartile range refers to the range of the middle
50% of the scores in a set of scores, once the scores have been placed in
order (high to low or low to high) or (T/F)?
17. In Question 6, the interquartile range would be?
18. The standard deviation is a measure of how much scores vary from the
median of the scores (T/F)?
19. The standard deviation was designed to describe the variability of the
scores in a normal distribution (T/F)?
20. If the 7 scores in a sample were 73, 90, 70, 88, 76, 84, and 65, the
standard deviation would be? Use the formula below to calculate the
standard deviation. Refer to the Calculation of the Standard Deviation of
a Sample document in Modules for help.
$s = \sqrt{\frac{N\sum X^2 - (\sum X)^2}{N(N-1)}}$
21. What is the shape of the frequency distribution shown here (see section 2
in the lecture notes)? (Just name the shape; you do not have to draw it
unless you want to do so to get the answer)
X f
10 55
9 42
8 30
7 13
6 5
