Quiz about Measures of Variability

Question 1

Which class has the higher test score median?

Accepted Answer

Class #1

Answer

Class # 2

Answer

The medians are equal

Answer

The median is not shown here.

Question 2

Which class was more consistent in their Algebra Scores?

Accepted Answer

Class #1

Answer

Class #2

Answer

Both classes had the same consistency.

Answer

50%

Question 3

What is the range of speeds tested?

Accepted Answer

0.5 mph

Answer

0.3 mph

Answer

1.5 mph

Answer

1.3 mph

Question 4

What is the range of miniature golf scores?

Accepted Answer

44

Answer

23

Answer

29

Answer

39

Question 5

The table shows the points earned by contestants in a competition. Find the range and the interquartile range of the points.

Accepted Answer

Range: 15; IQR: 10

Answer

Range: 15; IQR: 13

Answer

Range: 15; IQR: 12

Answer

Range: 15; IQR: 11

Question 6

What does this symbol represent?

Accepted Answer

Standard Deviation

Answer

Variance

Answer

Mean Absolute Deviation

Answer

Sigma

Question 7

Given a variance of 64, what is the standard deviation?

Accepted Answer

8

Answer

4096

Answer

0

Answer

6.8

Question 8

Which dot plot shows more consistency, LESS variation? a or b?

Accepted Answer

a

Answer

b

Question 9

Which restaurant has a greater IQR?

Accepted Answer

Lucy's Steakhouse

Answer

Gary's Grill

Answer

They are the same

Question 10

Which club has the smaller spread, less variation?

Accepted Answer

Car Hops

Answer

Cruisers

Question 11

These two dot plot shows the daily low temperatures for two cities for 15 days. Which city has a greater amount of VARIATION in temperatures?

Accepted Answer

Zoslow has greater variation because the range in temperature for Zoslow is greater than for Lahnston.

Answer

Both dot plots are bell shaped so they have the same variation.

Answer

Lahnston has greater variation because the range in temperature for Lahnston is greater than for Zaslow.

Answer

The dot plots are for different cities so we can't say.

Question 12

Ervin bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is the sample standard deviation of Ervin's scores?

Accepted Answer

20.94

Answer

511.33

Answer

22.61

Answer

438.48

Question 13

All of the below sets have the same mean.

Set 1-Standard Deviation=3.1

Set 2-Standard Deviation=4.9

Set 3-Standard Deviation=1.7

Set 4-Standard Deviation=3.2

Which set of data probably has the points closest to the mean?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 14

For a population of five university students with GPAs of 2.5, 2.3, 1.7, 1.4, and 1.1, find the population standard deviation.

Accepted Answer

0.53

Answer

0.41

Answer

0.35

Answer

0.22

Question 15

If test scores for a class are: 100, 100, 90, 90, 80, 80, 70, 70, 60, and 60, what are the mean and sample standard deviation?

Accepted Answer

mean = 80, stdev = 14.9

Answer

mean = 70, stdev = 14.9

Answer

mean = 80, stdev = 13.9

Answer

mean = 80, stdev = 12.9

Answer

mean = 85, stdev = 14.9

Question 16

The mean weight of a mouse is 0.44 lbs. with a standard deviation of 0.04 pounds. Interpret the standard deviation.

Accepted Answer

On average, the weight of a mouse differs from 0.44 lbs. by about 0.04 lbs.

Answer

The average mouse weights 0.48 lbs.

Answer

The weight of a mouse is 0.04 lbs. higher than the average.

Answer

On average, the weight of a mouse differs from 0.04 lbs. by 0.44 lbs.

Measures of Variability

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