Review Measures of Data

Which has a smaller standard deviation?

• a (purple)

• b (green)

A larger standard deviation means the data values are _______

• closer to the mean

• further from the mean

σ is which variable?

• mean

• number of values

• standard deviation

• individual data value

Calculate the mean: 3 4.5 6 7.8 9 12

• 8.46

• 42.3

• 7.05

• 6.9

Which describes the middle value in a data set?

• mean

• median

• range

• standard deviation

What is the range? 25 67 35 43 90 67 29

• 4

• 67

• 65

• 55

What is the mean? 12.8 12.8 12.9 12.7

• 51.2

• 12.8

• 12.7

• 12.9

Q3 = 30 Q1 = 21 What is the IQR?

• 9

• 51

• 25.5

• 21

What does Σ mean in the standard deviation equation?

• subtract

• sum of

• standard deviation

What is the square root of .267?

• .7

• .071

• .25

• .517