Section 2.3

Question 1

Standard Deviation

Answer 1

The standard deviation for a quantitative variable measures the spread of the data. The larger the SD, the more the data is spread out.

The SD shows distance of data from the mean

Question 2

95% Rule

Answer 2

If a distribution of data is approximately bell-shaped, about 95% of the data should fall within two standard deviation of the mean

µ – 2σ and µ + 2σ

Question 3

Z-score

Answer 3

Z-Scores put values on a common scale

z = x - mean / standard deviation

Question 4

Maximum

Answer 4

Largest data value

Question 5

Minimum

Answer 5

Smallest Data Value

Question 6

Quartile 1

Answer 6

Median of the values below the median

Question 7

Quartile 3

Answer 7

Median of the values above the median

Question 8

Five Number Summary

Answer 8

Minimum, Quartile 1, Median, Quartile 3, Maximum

Question 9

Range

Answer 9

Max - Min

Question 10

Interquartile Range

Answer 10

Q3 - Q1

Question 11

Percentile

Answer 11

The Pth percentile is the values which is greater than P% of the data