chapter 2 &3

Question 1

represents the number of data values in a sample

Answer 1

n

Question 2

a graph that represents the cumulative frequencies for the classes in a frequency distribution

Answer 2

ogive

Question 3

the arithmetic average of a distribution, obtained by adding the data values and then dividing by the number of data values

Answer 3

mean

Question 4

the mean found by multiplying each value by its corresponding weight and dividing by the sum of the weights

Answer 4

weighted mean

Question 5

the largest data value that can belong to the class

Answer 5

upper class limit

Question 6

represents the number of data values in a population

Answer 6

N

Question 7

a measure of how far the data values are spread out from the mean; standard deviation squared

Answer 7

variance

Question 8

the difference between the maximum and minimum values in a data set

Answer 8

range

Question 9

a measure of location which divides a set of data into 100 groups

Answer 9

percentile

Question 10

a measure of location which divides a set of data into 4 groups

Answer 10

quartile

Question 11

sum of the frequencies for that class and all previous classes

Answer 11

cumulative frequency

Question 12

a ratio that compares the frequency of each category to the total

Answer 12

relative frequency

Question 13

a graph of vertical bars representing the frequency distribution of a set of data

Answer 13

histogram

Question 14

a line graph used to present data from a frequency distribution

Answer 14

frequency polygon

Question 15

the middle data value in a distribution; half of the values are above it and half are below it

Answer 15

median

Question 16

the value(s) that occurs most frequently in a given data set

Answer 16

mode

Question 17

population mean

Answer 17

mu

Question 18

sample mean

Answer 18

x bar

Question 19

numbers that are used to describe the center of a set of data. these measures include mean, median, and mode

Answer 19

measure of center

Question 20

a display of values that occur in a data set and how often each value, or range of values, occurs

Answer 20

frequency distribution

Question 21

a category of data in a frequency distribution

Answer 21

class

Question 22

the lowest data value that can belong to the class

Answer 22

lower class limit

Question 23

data are separated into a stem and leaf by place value and organized in the form of a histogram

Answer 23

stemplot

Question 24

a bar graph whose bars are drawn in decreasing order of frequency or relative frequency

Answer 24

pareto chart

Question 25

a measure of how much we might expect a typical member of the data set to differ from the mean; the square root of variance

Answer 25

standard deviation

Question 26

describes the standard deviation relative to mean; a way to compare variation in different data sets when the means are substantially different

Answer 26

coefficient of variation

Question 27

population standard deviation

Answer 27

lower case sigma

Question 28

sample standard deviation

Answer 28

s

Question 29

a value that lies very far away from the vast majority of other values in a dataset

Answer 29

outlier