Measure Center and Variablilty

Measure Center and Variablilty

Standard 7.sp.d.8b

Evaluating data

How data changes

Measure of Center

• mean

• median

Measure of variability

• Range

• quartile ranges

Multiple Choice

Find the median:
5, 6, 3, 9, 0, 4, 1, 2, 7

• 4
• 4.1
• 5
• 4.5

Multiple Choice

Find the mean of these numbers:
5,11,2,12,4,2

• 4.1
• 6
• 4.5
• 4

Multiple Choice

Roger bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 112, 193, 142. What is the range of Roger's scores?

• 62

• 66

• 81

• 193

Multiple Choice

When calculating the range of a data set, I need to

• subtract maximum - minimum

• subtract Q₃ - Q₁

• subtract minimum - maximum

• subtract minimum - maximum

Skew

• make biased or distorted in a way that is regarded as inaccurate, unfair, or misleading.

• 
  

When to use

mean. median

outliers

how they effect data sets