Question 1

Another name for the variance is the

Accepted Answer

A)  standard deviation. 
B)  mean square. 
C)  extended range. 
D)  average deviation.

Question 2

What are outliers? What problems can they create when calculating the arithmetic mean? How might this problem be resolved?

Accepted Answer

The answer of What are outliers? What problems can they...

Question 3

In the data set consisting of 3, 3, 3, 5, 5, 9, what is the mode?

Accepted Answer

A)  3 
B)  4 
C)  4.67 
D)  6

Question 4

When Steven M. Kosslyn asserts that the mind is not a camera; the mind judges a book by its cover; and the spirit is willing, but the mind is weak, what do these principles mean for researchers when they are presenting data in visual form?

Accepted Answer

The answer of When Steven M. Kosslyn asserts that the...

Question 5

Scores from data sets with different ranges can be compared and combined using their respective

Accepted Answer

A)  means. 
B)  variances. 
C)  standard deviations. 
D)  z scores.

Question 6

A standard normal distribution has a mean of _____ and a standard deviation of _____.

Accepted Answer

A)  0; 1 
B)  1; 0 
C)  1; 1.5 
D)  0; .5

Question 7

Which of the following measures of spread is intended to take into account the possible imprecision of the measurement instrument?

Accepted Answer

A)  the crude range 
B)  the interquartile range 
C)  the variance 
D)  the extended range

Question 8

Cognitive psychologist Stephen M. Kosslyn wrote about three interrelated principles describing how the brain perceives and processes visual information. These three principles can be described as which of the following?

Accepted Answer

A)  1. to perceive is to immobilize; 2. mind over matter; and 3. the mind judges a book by its cover. 
B)  1. the spirit is willing, but the mind is weak; 2. mind over matter; and 3. those who exert the first influence upon the mind, have the greatest power 
C)  1. the mind is not a camera; 2. the mind judges a book by its cover; and 3. the spirit is willing, but the mind is weak. 
D)  1. mind over matter; 2. to perceive is to immobilize; and 3. the mind is not a camera.

Question 9

The score that occurs with the greatest frequency in a data set is the

Accepted Answer

A)  mode. 
B)  median. 
C)  mean. 
D)  variance.

Question 10

Which measure of spread represents simply the difference between the highest score and the lowest score?

Accepted Answer

A)  standardized range 
B)  crude range 
C)  extended range 
D)  interquartile range

Question 11

To visualize the overall pattern of the data, it is often useful to create a

Accepted Answer

A)  frequency distribution. 
B)  measure of location. 
C)  measure of spread. 
D)  standardized score.

Question 12

Chris calculates the distance between the 25th and 75th percentile in a data set. Chris is interested in identifying the

Accepted Answer

A)  interquartile range. 
B)  standard deviation. 
C)  crude range. 
D)  extended range.

Question 13

In a normal distribution, the mean is __________ the median.

Accepted Answer

A)  more meaningful than 
B)  equal to 
C)  smaller than 
D)  larger than

Question 14

Differentiate between symmetrical, positively skewed, and negatively skewed distributions.

Accepted Answer

The answer of Differentiate between symmetrical, positively skewed, and negatively...

Question 15

In a normal distribution of population scores, roughly how many of these scores will fall between -1σ and +1σ?

Accepted Answer

A)  2% 
B)  50% 
C)  68.3% 
D)  95%

Question 16

Why would one calculate the confidence interval for a mean?

Accepted Answer

The answer of Why would one calculate the confidence interval...

Question 17

Why is it useful to identify the central tendency of a data set? Describe three measures of central tendency.

Accepted Answer

The answer of Why is it useful to identify the...

Question 18

A point in a data set which indicates that a known proportion of the data falls above that point and a known proportion of the data falls below that point is called a

Accepted Answer

A)  mean. 
B)  percentile. 
C)  histogram. 
D)  mode.

Question 19

Which popular measure of spread is calculated by taking the square root of the variance?

Accepted Answer

A)  the average deviation 
B)  the mean square 
C)  the standard deviation 
D)  the standard score

Question 20

Using a trimmed mean to measure central tendency may be appropriate when the distribution of the scores is

Accepted Answer

A)  symmetrical. 
B)  normal. 
C)  standardized. 
D)  asymmetrical.

Exam 10: Summarizing the Data