Chapter 2

Question 1

What is a frequency table?

Question 2

What are raw frequency counts (or tallies)?

Question 3

How are relative frequencies different from raw frequencies?

Question 4

What is a bar graph and how does it differ from a histogram?

Question 5

What is the difference between relative frequency and cumulative relative frequency?

Question 6

Explain why the concept of an interval does not pertain to qualitative variables.

Question 7

How do the real limits of an interval relate to the interval width and interval midpoint?

Question 8

What are the score limits of an interval?

Question 9

What is a sampling experiment?

Question 10

What is the outcome of a sampling experiment?

Question 11

Is an event different from an outcome? Explain.

Question 12

How does a proportion relate to probability?

Question 13

What does it mean to say that two events are mutually exclusive?

Question 14

What does it mean to say that two events are independent?

Question 15

Give an example of a conditional probability.

Question 16

Is there a difference between a relative frequency distribution and a probability distribution? Please explain.

Question 17

State whether the following statement is true or false:

A frequency table can be thought of as a probability distribution.

Question 18

State whether the following statement is true or false:

A frequency table can be thought of as a probability density function.

Question 19

State whether the following statement is true or false:

A value of 19.4999 falls in an interval with score limits of 20–29.

Question 20

State whether the following statement is true or false:

The probability of drawing a face card from a deck of 52 cards is .2308.

Question 21

State whether the following statement is true or false:

The probability of drawing a red ace from a deck of 52 cards is .0385.

Question 22

State whether the following statement is true or false:

The probability of drawing the ace of spades or the ace of hearts from a deck of 52 cards is .0385.

Question 23

State whether the following statement is true or false:

For large samples with many different values of the variable, we should have a small number of intervals when constructing a frequency table.

Question 24

State whether the following statement is true or false:

In 50 flips of a fair coin, it came up heads 28 times. Therefore, the probability of coming up heads is .56.

Question 25

State whether the following statement is true or false:

If the interval width is 10, then 35–44 is a possible interval for the lowest score limits.

Question 26

State whether the following statement is true or false:

In a frequency table for a qualitative variable, values of the variable should be listed from largest to smallest.

Question 27

State whether the following statement is true or false:

The only difference between a bar graph and a histogram is the labeling of the y-axis.

Question 28

State whether the following statement is true or false:

The range of 100 scores is 50; therefore, 20 would be a reasonable interval width.

Question 29

State whether the following statement is true or false:

A collection of reaction times ranges from .936 seconds to 2.301 seconds. Therefore, a reasonable interval width would be 20 milliseconds.

Question 30

State whether the following statement is true or false: