Question 1

If  ,  ,  , ...,  are the N observations of a variable from a population, then the population mean is symbolized by
A) 
B) ?
C) X
D) ?

Accepted Answer

D

Question 2

Each year advertisers spend billions of dollars purchasing commercial time on network sports television. In the first 6 months of 1988, advertisers spent $1.1 billion. A recent article listed the top 10 leading spenders (in millions of dollars):  Calculate the mean amount spent.
A) 39.18 million dollars
B) 51.50 million dollars
C) 20.01 million dollars
D) 400.44 million dollars

Accepted Answer

A

Question 3

The following data represents a random sample of 15 complaints registered with the customer service department of a store. Determine the median complaint. 
A) Messy store
B) No median
C) Defective product
D) Excessive waiting time

Accepted Answer

B

Question 4

Each year advertisers spend billions of dollars purchasing commercial time on network sports television. In the first 6 months of 1988, advertisers spent $1.1 billion. A recent article listed the top 10 leading spenders (in millions of dollars):  Calculate the median.
A) 39.67 million dollars
B) 28.90 million dollars
C) 51.50 million dollars
D) 5.38 million dollars

Accepted Answer

The answer of Each year advertisers spend billions of dollars...

Question 5

Many firms use on-the-job training to teach their employees new software. Suppose you work in the personnel department of a firm that just finished training a group of its employees in new software, and you have been requested to review the performance of one of the trainees on the final test that was given to all trainees. The mean of the test scores is 79. Additional information indicated that the median of the test scores was 89. What type of distribution most likely describes the shape of the test scores?
A) unable to determine with the information given
B) skewed to the left
C) symmetric
D) skewed to the right

Accepted Answer

When the mean is less than the median, it suggests a left-skewed distribution, because a few low scores pull the mean down more than the median.

Question 6

A severe drought affected several western states for 3 years. A Christmas tree farmer is worried about the drought's effect on the size of his trees. To decide whether the growth of the trees has been retarded, the farmer decides to take a sample of the heights of 25 trees and obtains the following results (recorded in inches):  Which measure of central tendency would be considered the best measure to use in this problem?
A) range
B) median
C) mode
D) mean

Accepted Answer

The answer of A severe drought affected several western states...

Question 7

Calculate the mean, median, and mode for the following sample: 5, 10, 6, 100, 0, 0, 10, 0.

Accepted Answer

The answer of Calculate the mean, median, and mode for...

Question 8

The accompanying data set contains quiz scores for 12 students in a chemistry class: 18, 15, 5, 8, 15, 20, 2, 16, 10, 12, 20, 15.
a. Find a measure of central tendency that separates the data into two groups such that each groupconsists of 50% of the scores above and 50% of the scores below that measure.
b. Find a measure of central tendency that represents the quiz score that occurs most often.
c. Find a measure of central tendency that represents the average of the 12 quiz scores.

Accepted Answer

The answer of The accompanying data set contains quiz scores...

Question 9

The high temperatures (in degrees Celsius) each day over a three week period were as follows: 17, 18, 20, 22, 21, 19, 16, 15, 18, 20, 21, 21, 22, 21, 19, 20, 19, 17, 16, 16, 17. Compute the mean, median, and mode.

Accepted Answer

The answer of The high temperatures (in degrees Celsius) each...

Question 10

In a sample of 18 students at East High School the following number of days of absences were recorded for the previous semester: 4, 3, 1, 0, 4, 2, 3, 0, 1, 2, 3, 0, 4, 1, 1, 5, 1, 1. Compute the mean, median, and mode.

Accepted Answer

The answer of In a sample of 18 students at...

Question 11

The number of goals scored by a random sample of 16 hockey players for a given season are 5, 3, 21, 10, 7, 2, 0, 30, 19, 6, 4, 7, 10, 5, 7, and 24. Compute the mean, median, and mode.

Accepted Answer

The answer of The number of goals scored by a...

Question 12

The following data represent the bachelor degrees of CEO's at area small businesses. Determine the mode degree. 
A) marketing
B) no mode
C) accounting
D) business

Accepted Answer

The answer of The following data represent the bachelor degrees...

Question 13

The following data represent a random sample of 15 complaints registered with the customer service department of a store. Determine the mode complaint. 
A) excessive waiting time
B) no mode
C) defective product
D) rude personnel

Accepted Answer

The answer of The following data represent a random sample...

Question 14

Compute the range for the set of data.
-10, 11, 12, 13, 14
A) 4
B) 0.8
C) 14
D) 10

Accepted Answer

The range of a set of data is the difference between the highest and lowest values in the set. For the given data (10, 11, 12, 13, 14), the highest value is 14 and the lowest value is 10. Therefore, the range is 14 - 10 = 4.

Question 15

Compute the range for the set of data.
-8, 8, 8, 17, 23, 23, 23
A) 56.6
B) 15
C) 15.7
D) 17

Accepted Answer

The range of a set of data is the difference between the highest and lowest values in the set. For the given data set, the highest value is 23 and the lowest is 8. Therefore, the range is 23 - 8 = 15.

Question 16

Compute the range for the set of data.
-6, 16, 6, 16, 6, 16, 6, 16
A) 10
B) 11
C) 20
D) 16

Accepted Answer

The range of a set of data is the difference between the highest and lowest values in the set. For the given data set, the highest value is 16 and the lowest value is 6. Therefore, the range is 16 - 6 = 10.

Question 17

Compute the range for the set of data.
-6, 17, 3, 13, 12
A) 17
B) 3
C) 14
D) 6

Accepted Answer

The range of a set of data is the difference between the highest and lowest values. In this set, the highest value is 17 and the lowest is 3. Therefore, the range is 17 - 3 = 14.

Question 18

Compute the range for the set of data.
-4, 9, 6, 1, 7, 13, 7, 9, 4
A) 6.7
B) 13
C) 14
D) 12

Accepted Answer

The range of a set of data is the difference between the highest and lowest values in the set. For the given data set (4, 9, 6, 1, 7, 13, 7, 9, 4), the highest value is 13 and the lowest value is 1. Therefore, the range is 13 - 1 = 12.

Question 19

Compute the range for the set of data.
-76, 145, 14, 111, 179
A) 105
B) 165
C) 179
D) 14

Accepted Answer

The answer of Compute the range for the set of...

Question 20

Compute the range for the set of data.
-120, 553, 133, 641, 398, 335
A) 363.3
B) 641
C) 521
D) 120

Accepted Answer

The range of a set of data is the difference between the highest and lowest values. In this set, the highest value is 641 and the lowest is 120. Therefore, the range is 641 - 120 = 521.

Quiz 3: Numerically Summarizing Data

If , , , ..., are the N observations of a variable from a population, then the population mean is symbolized by

Each year advertisers spend billions of dollars purchasing commercial time on network sports television. In the first 6 months of 1988, advertisers spent $1.1 billion. A recent article listed the top 10 leading spenders (in millions of dollars) : Calculate the mean amount spent.

The following data represents a random sample of 15 complaints registered with the customer service department of a store. Determine the median complaint.

Each year advertisers spend billions of dollars purchasing commercial time on network sports television. In the first 6 months of 1988, advertisers spent $1.1 billion. A recent article listed the top 10 leading spenders (in millions of dollars) : Calculate the median.

Calculate the mean, median, and mode for the following sample: 5, 10, 6, 100, 0, 0, 10, 0.

The high temperatures (in degrees Celsius) each day over a three week period were as follows: 17, 18, 20, 22, 21, 19, 16, 15, 18, 20, 21, 21, 22, 21, 19, 20, 19, 17, 16, 16, 17. Compute the mean, median, and mode.

In a sample of 18 students at East High School the following number of days of absences were recorded for the previous semester: 4, 3, 1, 0, 4, 2, 3, 0, 1, 2, 3, 0, 4, 1, 1, 5, 1, 1. Compute the mean, median, and mode.

The number of goals scored by a random sample of 16 hockey players for a given season are 5, 3, 21, 10, 7, 2, 0, 30, 19, 6, 4, 7, 10, 5, 7, and 24. Compute the mean, median, and mode.

The following data represent the bachelor degrees of CEO's at area small businesses. Determine the mode degree.

The following data represent a random sample of 15 complaints registered with the customer service department of a store. Determine the mode complaint.

Compute the range for the set of data. -10, 11, 12, 13, 14

Compute the range for the set of data. -8, 8, 8, 17, 23, 23, 23

Compute the range for the set of data. -6, 16, 6, 16, 6, 16, 6, 16

Compute the range for the set of data. -6, 17, 3, 13, 12

Compute the range for the set of data. -4, 9, 6, 1, 7, 13, 7, 9, 4

Compute the range for the set of data. -76, 145, 14, 111, 179

Compute the range for the set of data. -120, 553, 133, 641, 398, 335