Chapter 2

Question 1

The area principle says that the ____ occupied by a part of the graph should correspond to the _________ of the value it represents.

Answer 1

area, magnitude.

Question 2

Define the area principle.

Answer 2

Ina a statistical display, each data value should be represented by the same amount of area.

Question 3

Distribution of a variable gives what 2 key characteristics?

Answer 3

The possible values of the variable and the relative frequency of each value.

Question 4

Name 3 displays of single categorical variable used in lecture.

Answer 4

Pie charts, frequency tables, and bar charts.

Question 5

Define frequency table and (relative frequency table).

Answer 5

A frequency table lists the categories in a categorical variable and gives the count (or percentage) of observations for each category.

Question 6

Define Bar chart and (relative frequency bar chart)

Answer 6

Bar charts show a bar whose area represents the count (or percentage) of observations for each categorical variable.

Question 7

Pie chart

Answer 7

Pie charts show how a “whole” divides into categories by showing a wedge of a circle whose area corresponds to the proportion in each category.

Question 8

Define the statistics defintion for frequency.

Answer 8

In statistics the frequency (or absolute frequency) of an event i is the number of n_i times the event occurred in an experiment or study.