Descriptive Statistics Review

Which of the following isn't a measure of center?

• mean

• range

• median

• mode

Which of the following isn't a measure of spread?

• mean

• range

• standard deviation

• interquartile range

If a data distribution has one peak in the center and is symmetrical (looks like a bell) we call this a

• uniform distribution

• parabolic distribution

• skewed distribution

• normal distribution

Variance and standard deviation are both advanced ways of calculating

• center

• outliers

• consistency/predictability

• skew

Calculate the median:

3 9 8 11 4 3 9

• 3

• 8

• 4

• 9

Calculate the median:

192 239 91 100 130 83

• 100

• 115

• 130

• 192

Calculate the mean:

9 23 8 7 11

• 11.6

• 9

• 11

• 15

A teacher gives a test and the median is 77 while the average is 89. This indicates:

• positive skew

• negative skew

• no outliers

A group of marathon runners have the following distribution for their weight:

min: 124

Q1: 155

median: 164

Q3: 188

max: 231

The interquartile range is:

• 107

• 164

• 33

• 67

Consider the dataset:
3 9 0 9 7 13
If the 13 was changed to a 6, the standard deviation would

• stay the same

• decrease

• increase