Question 1

The mode can be used to describe modal distributions.

Accepted Answer

A) True 
 B)False  True

Question 2

Which of the following statements about a weighted mean is true.

Accepted Answer

A)  The weighted mean is always equal to the arithmetic mean.
B)  The weight mean can only be reported id the sample size is equal in each group.
C)  The weighted mean is used to compute the combined mean for two or more samples of scores in which the number of scores in each sample is disproportionate or unequal.
D)  The weighted mean is heavier than an arithmetic mean. C

Question 3

Which of the following is not a symbol used with samples:

Accepted Answer

A)  x
B)  M
C)   μ\muμ 
D)  n  C

Question 4

The mathematical term ∑x is the numerator for

Accepted Answer

A)  the population mean
B)  the sample mean
C)  both A and B
D)  None;this term is not in the numerator for any calculation.

Question 5

The weighted mean can be computed to determine the mean for samples with unequal sample sizes.

Accepted Answer

A) True 
 B)False

Question 6

The ________ is the middle value in a distribution of scores that are listed in numeric order.

Accepted Answer

A)  mean
B)  median
C)  mode
D)  range

Question 7

The sample size is in the denominator of the calculation of a sample mean.

Accepted Answer

A) True 
 B)False

Question 8

Given the same set of data for a population and sample,would the mean for both data sets be equal?

Accepted Answer

A)  no,the population mean would be larger
B)  no,the sample mean would be larger
C)  yes,but only if the sample size equaled the population size
D)  yes,this would be true anytime both data sets are the same

Question 9

To measure attraction,a researcher records the following data for the distance (in inches)between two persons sitting in a waiting room: 46,32,10,23,18,46,and 60.Is the mode equal to the median in this example?

Accepted Answer

A)  Yes.
B)  No;the median is larger than the mode.
C)  No;the mode is larger than the median.
D)  There is not enough information to answer this question.

Question 10

Some,but not all scores in a distribution,influences the value of the mean.

Accepted Answer

A) True 
 B)False

Question 11

The ________ is an arithmetic mean of a weighted or disproportionate set of scores.

Accepted Answer

A)  mean
B)  weighted mean
C)  median
D)  mode

Question 12

A researcher asks adult participants to rank their top five favorite songs from their childhood.Based on the scale of measurement described,which measure of central tendency is most appropriate to describe these data?

Accepted Answer

A)  mean
B)  median
C)  mode
D)  range

Question 13

A researcher measures the following scores on a quiz: 0,3,7,3,5,4,and 6.In this example,the mean is larger than the median.

Accepted Answer

A) True 
 B)False

Question 14

The mean is the balance point for a distribution.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following will decrease the value of the mean?

Accepted Answer

A)  deleting a score below the mean
B)  adding a score below the mean
C)  adding a score exactly equal to the mean
D)  none of the above

Question 16

A researcher measures the depth (in fathoms)of different points in the ocean affected most by pollution.Based on the scale of measurement for these data,describing the mean depth is appropriate.

Accepted Answer

A) True 
 B)False

Question 17

The ________ is the sum of all scores (in a sample or population)divided by the number of scores summed.

Accepted Answer

A)  mode
B)  median
C)  mean
D)  range

Question 18

A staff member records the number of victories (per 10-game season)for a new football coach during his first three seasons with a team.The coach won 1,3,and 8 games respectively over the three seasons.Which conclusion is appropriate?

Accepted Answer

A)  The football coach won an average of four games per season.
B)  The football coach won a median of three games per season.
C)  The football coach won 40% of his games during his first three seasons.
D)  all of the above

Question 19

A researcher asks participants to estimate the calories they consume in a meal.The researcher records the following estimates: 450,426,310,500,and 220.If the researcher removes the estimate of 220 (perhaps because the participant drops out of the study),then the value of the mean will

Accepted Answer

A)  decrease
B)  increase
C)  remain the same
D)  become negative

Question 20

Although the mean is a measure of central tendency,it is not always located exactly at the center of a distribution.

Accepted Answer

A) True 
 B)False

Exam 3: Summarizing Data: Central Tendency

The mode can be used to describe modal distributions.

Which of the following statements about a weighted mean is true.

Which of the following is not a symbol used with samples:

The mathematical term ∑x is the numerator for

The weighted mean can be computed to determine the mean for samples with unequal sample sizes.

The ________ is the middle value in a distribution of scores that are listed in numeric order.

The sample size is in the denominator of the calculation of a sample mean.

Given the same set of data for a population and sample,would the mean for both data sets be equal?

To measure attraction,a researcher records the following data for the distance (in inches) between two persons sitting in a waiting room: 46,32,10,23,18,46,and 60.Is the mode equal to the median in this example?

Some,but not all scores in a distribution,influences the value of the mean.

The ________ is an arithmetic mean of a weighted or disproportionate set of scores.

A researcher asks adult participants to rank their top five favorite songs from their childhood.Based on the scale of measurement described,which measure of central tendency is most appropriate to describe these data?

A researcher measures the following scores on a quiz: 0,3,7,3,5,4,and 6.In this example,the mean is larger than the median.

The mean is the balance point for a distribution.

Which of the following will decrease the value of the mean?

A researcher measures the depth (in fathoms)of different points in the ocean affected most by pollution.Based on the scale of measurement for these data,describing the mean depth is appropriate.

The ________ is the sum of all scores (in a sample or population) divided by the number of scores summed.

A staff member records the number of victories (per 10-game season) for a new football coach during his first three seasons with a team.The coach won 1,3,and 8 games respectively over the three seasons.Which conclusion is appropriate?

A researcher asks participants to estimate the calories they consume in a meal.The researcher records the following estimates: 450,426,310,500,and 220.If the researcher removes the estimate of 220 (perhaps because the participant drops out of the study) ,then the value of the mean will

Although the mean is a measure of central tendency,it is not always located exactly at the center of a distribution.