Question 1 The median for the data set 15, 18, 12, 17, 13 and 20 is the number 17.

	True
	False

Question 2

The number of gallons of gasoline pumped by a filling station during a day is an example of qualitative data.

	True
	False

Question 3

The standard deviation of the sample data: 8, 12, 15, 7, 11 and 10 is 2.88.

	True
	False

Question 4

The variance of the sample data: 19, 25, 17, 21, 18, 15, and 24 is 10.5.

	True
	False

Question 5

The number of hot dogs sold at the fair is an example of discrete data.

	True
	False

Question 6

Based on a survey of 3,000 people in the U.S., the civilian unemployment rate in the United States was 4.5%. The 4.5% unemployment is referred to as a statistic.

	True
	False

Question 7

In a positively skewed distribution, the mode is less than the median.

	True
	False

Question 8

The median of a data set is the middle value when the original data values are arranged in order of increasing magnitude.

	True
	False

Question 9

Negatively skewed indicates that a distribution is not symmetrical. The long tail is to the left or in the negative direction.

	True
	False

Question 10

The height of a bar in a histogram represents the number of observations for a class.

	True
	False

Question 11

An automobile dealer wants to construct a pie chart to represent the different types of cars sold in October. He sold 90 cars, and 20 of the cars are convertibles. The convertibles will represent how many degrees in the pie chart? (Hint: A circle has 360 degrees)

	100 degrees
	90 degrees
	60 degrees
	80 degrees

Question 12

For the following data: 5, 9, 2, 11, 7, 19, 8, what is the range?

	19
	17
	7
	3

Question 13

Which measures of central tendency are not affected by extremely low or extremely high values?

	Mean and mode
	Mean and medium
	None of above
	Mode and medium

Question 14

A marketing class of 50 students evaluated the instructor using the following scale: superior, good, average, poor, and inferior. The descriptive summary showed the following survey results: 2% superior, 8% good, 45% average, 45% poor, and 0% inferior.

	Most students rated the instructor as poor or average.
	The instructor's performance was great!
	No conclusions can be made.
	The instructor's performance was inferior!

Question 15

The methods used to estimate a property of a population based on a sample is called what?

	Probability
	Descriptive Statistics
	Inferential Statistics
	Ratio-Level Data

Question 16

If you look at the coins in your pocket and state that you have more dimes than any other coin, what measure of center are you using?

	Median
	Mode
	Midrange
	Mean

Question 17

What is the midpoint of an ordered data array called?

	Mode
	Mean
	Median
	Balance Point

Question 18

Hourly Wages Number of Wage Earners

$4 up to $7 18

$7 up to $10 20

$10 up to $13 36

$13 up to $16 6

What is the class midpoint for the class with the highest frequency?

	$8.50
	$14,50
	$5.50
	$11.50

Question 19

Hourly Wages Number of Wage Earners

$4 up to $7 18

$7 up to $10 20

$10 up to $13 36

$13 up to $16 6

In the above table, what is the class interval for the hourly wages?

	$5
	$4
	$3
	$2

Question 20

The number of games won by 20 randomly selected college football teams was as follows: 8, 10, 11, 7, 6, 8, 4, 6, 4, 10, 1, 8, 12, 5, 6, 7, 14, 9, 7, 5.

Find the range R, mean, median, sample standard deviation, and mode.

Question 21

8, 10, 11, 7, 6, 8, 4, 6, 4, 10, 1, 8, 12, 5, 6, 7, 14, 9, 7, 5.

Use the Empirical Rule to determine an interval which contains approximately 95% of the observations assuming the frequency distribution is bell-shaped.

Question 22

For this data set (8, 10, 11, 7, 6, 8, 4, 6, 4, 10, 1, 8, 12, 5, 6, 7, 14, 9, 7, 5), what is the interquartile range? What does the interquartile range represent?

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Question 23

What is the relative frequency for the number of wage earners with wages in the $7 up to $10 class?

Hourly Wages Number of Wage Earners

$4 up to $7 18

$7 up to $10 20

$10 up to $13 36

$13 up to $16 6

Question 24

Draw a Box Plot for the following data:

8, 10, 11, 7, 6, 8, 4, 6, 4, 10, 1, 8, 12, 5, 6, 7, 14, 9, 7, 5

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