Chapter 2

Question 1

What is a data value?

Answer 1

An individual entry in a data set

pg. 30

Question 2

What is a frequency?

Answer 2

The number of data values in a category

e.g. 3 people have brown hair the frequency is 3

pg. 30

Question 3

What is a frequency distribution?

Answer 3

a table that with categories on the left and frequencies on the right

pg. 30

Question 4

What does relative mean?

Answer 4

Use percents

pg. 31

Question 5

What is a relative frequency distribution?

Answer 5

a table with categories on the left and frequency percents on the right

% found by dividing the frequency by the total # of data values

pg. 31

Question 6

What is cumulative frequencey distribution?

Answer 6

a table with the frequencies being added to the together down the line

means that data is = to the category or less ;cumulative means ‘adding u

pg. 32

Question 7

What is a histogram?

Answer 7

A bargraph with bars that touch, categories are horizontal and frequencies are vertical

pg. 33

Question 8

What is a reative frequency histogram?

Answer 8

a bargraph with bars that touch using percetages

percentages are vertical axis

pg. 34

Question 9

What is normal distribution?

Answer 9

When a graph has a single high point in the middle and low on the ends, symmetrical, and looks like a ‘bell curve’

pg. 35

Question 10

What is classed frequently distribution?

Answer 10

a table with categories classes(range) on the left and frequency on the right

classes=group, e.g. 40-49

pg. 36

Question 11

What are lower class limits?

Answer 11

the smaller of two numbers used to define each class

e.g. if the class is 40-49 the lower is 40

pg. 37

Question 12

What are upper class limits?

Answer 12

the larger of the two numbers used to define each class

e.g. if the class is 40-49 the upper is 49

pg. 37

Question 13

What is the class width?

Answer 13

the difference between two neighboring lower class limits

e.g. class 1: 40-49 class 2: 50-59; 50-40=10 class width is 10

pg. 38

Question 14

What is the class boundaries?

Answer 14

halfway between an upper class limit and its neighboring lower class limit, to find the cut off between classes

upper(1)+lower(2)/2=boundaries

pg. 38

Question 15

What is the class midpoint?

Answer 15

halfway between the lower class limit and upper class limit for each class, average within a class

lower+upper/2=midpoint

pg. 39

Question 16

What is a frequency polygon?

Answer 16

a line segment using the class midpoint value on the horizontal axis with extra categories extended at beginning and end

find extra by adding class width to high/low midpoint

pg. 40

Question 17

What is an ogive?

pronounced ‘oh-jive’

Answer 17

a line graph based on the cumulative frequency distribution with an extra category only at the start

extra for a strating point of 0

pg. 43

Question 18

What is a pareto chart?

Answer 18

a bargraph based on frequency distribution but with qualitative data and should be in descending order according to frequently

qualitative=lables(not numbers), high to low

pg. 44

Question 19

What is a dotplot?

Answer 19

horizontal line with categories and dots stacking for frequency

pg. 46

Question 20

What is a stemplot/stem and leave plot?

Answer 20

a way to represent data with stems on the left usually the ten’s place and leaves on the right usually the one’s place

e.g. 0|2,3,5,7,=02,03,05,07
e.g. 1|1,2,3,3,=11,12,13,13

pg. 46

Question 21

What is a time-series graph?

Answer 21

a line graph that tracks the value of some quantity through time, consists of pairs of data with time on the horizontal axis and value on the vertical

e.g. vaule=stock prices, time=months

pg. 47