Quiz about Statistics and Probability

Question 1

When you add all the data and then divide by number of data points, this is called

Accepted Answer

mean

Answer

median

Answer

outlier

Question 2

If you have a date set that has identical numbers, the best measure of center to use is:

Accepted Answer

mode

Answer

range

Answer

mean

Question 3

If the data set has no extreme values or numbers that are identical, it is best to use _________ to find the measure of center.

Accepted Answer

mean

Answer

median

Answer

mode

Question 4

The measure of variability is:

Accepted Answer

median

Accepted Answer

range, first quartile, third quartile,

Accepted Answer

interquartile range, outliers

Question 5

The following data is showing the number of cell phones returned to the manufacturer each month for a year.

Number of Cell Phones Returned:

20 15 24 37 55 1 39 40 3 35 28 0

What are the mean, median, and mode of the data?

Accepted Answer

mean = 24.75; median = 26; no mode

Answer

mean = 27.00; median = 26; no mode

Answer

mean = 24.75; median = 20; mode = 55

Question 6

The following data is showing the number of cell phones returned to the manufacturer each month for a year.

Number of Cell Phones Returned:

20 15 24 37 55 1 39 40 3 35 28 0

A manufacturer wants to claim that it has a low cell phone return rate. Choose the best measure(s) of center for the manufacturer to use.

Accepted Answer

mean

Answer

median

Answer

mode

Question 7

The table shows the number of homes in 12 different counties that use a solar heating system.

Number of Homes with Solar Heating System:

83 63 82 78 74 90 59 68 71 59 88 85

Which measure of variability does not correspond to the data?

Accepted Answer

range = 90

Answer

median = 76

Answer

third quartile = 84

Question 8

What are the mean and the mean absolute deviation of the data set: 7, 8, 4, 5, 8, 3, 5, 6?

Accepted Answer

mean = 6.25; mean absolute deviation = 1.2

Answer

mean = 5.75; mean absolute deviation = 1.5

Answer

mean = 5.75; mean absolute deviation = 1.2

Question 9

Mr. Hou put student names in a hat and selected five names without looking. What type of sample did he use?

Accepted Answer

simple random sample

Answer

biased sample

Answer

voluntary response survey

Question 10

Which inference can be supported by the double box plot?

Accepted Answer

The medians are about the same but the variability in the top plot is much greater than the variability in the bottom plot.

Answer

The data is symmetric in both box plots

Answer

The third and first quartiles of the top plot are both less than those of the bottom plot.

Question 11

A six-sided number cube whose sides are numbered 1 through 6 is rolled. What are the probability and the likelihood of the cube landing on an odd number?

Accepted Answer

1/2 ; equally likely

Answer

1; certain

Answer

1/6 ; equally unlikely

Question 12

A spinner with four equal-size sections marked X, Y, Z, and Q is spun 100 times. The spinner lands on X 20 times. Which comparison of the experimental probability and theoretical probability of the spinner landing on X is valid?

Accepted Answer

20% < 25%

Answer

20% = 20%

Answer

20% < 50%

Question 13

When Blake loads a washing machine, he needs to choose a load setting of large, delicate, or small; a water temperature setting of hot, warm, or cold; and a regular rinse cycle or an extra rinse cycle. What is the possible number of outcomes in this situation?

Accepted Answer

18

Answer

8

Answer

27

Statistics and Probability

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