Chapter 3

Question 1

A numerical summary of a population of interest

Answer 1

population parameter

Question 2

A numerical summary of a sample

Answer 2

statistic

Question 3

is the middle value of the data set

Answer 3

median

Question 4

The value that occurs most often in a data set

Answer 4

mode

Question 5

is the class with the highest frequency

Answer 5

model class

Question 6

is the average of the maximum and minimum of the data set.

Answer 6

midrange

Question 7

It measures how far apart the most extreme values in a data set are

Answer 7

range

Question 8

is the average squared distance that observations are from the mean

Answer 8

sample variance

Question 9

is the average distance, or deviation, that observations are from the mean

Answer 9

sample standard deviation

Question 10

measures the spread of a data set relative to its mean

Answer 10

coefficient of variation

Question 11

describes the number of standard deviations that the value is above or below the average value.

Answer 11

z score or standard score

Question 12

is the 25th percentile

Answer 12

first quartile Q1

Question 13

is the 75th percentile

Answer 13

third quartile Q3

Question 14

is the 50th percentile

Answer 14

median MD

Question 15

denoted p1, p2. divide the data set into equal groups

Answer 15

percentiles

Question 16

to depict the distribution of the data with a boxplot of the 5 number summary or with a stem and leaf plot

Answer 16

exploratory data analysis

Question 17

a data set is composed of: minimum, Q1, MD, Q3, maximum

Answer 17

5 number summary

Question 18

is a plot of the 5 number summary that depicts the middle half of the data with a box and the outside half of the data with lines

Answer 18

box plot

Question 19

are identified as any number larger than Q3 + 1.5IQR or smaller than Q1 - 1.5IQR

Answer 19

outliers