Question 1

A normal distribution

Accepted Answer

A)   has more than half of its data points to the left of the median.
B)   has more than half of its data points to the right of the mean.
C)   has 95% of its data points within one standard deviation of the mean.
D)   is symmetrical.E) B) and C)
F) All of the above

Question 2

A z score of 1.25 represents an observation that is

Accepted Answer

A)   1.25 standard deviation below the mean.
B)   0.25 standard deviations above the mean of 1.
C)   1.25 standard deviations above the mean.
D)   both b and cE) C) and D)
F) None of the above

Question 3

Which of the following is a good reason to convert data to z scores?

Accepted Answer

A)   We want to be able to estimate probabilities or proportions easily.
B)   We think that it is easier for people to work with round numbers.
C)   We want to make a skewed set of data into a normally distributed set of data.
D)   all of the aboveE) B) and D)
F) A) and D)

Question 4

In a normal distribution, about how much of the distribution lies within two (2)  standard deviations of the mean?

Accepted Answer

A)   33% of the distribution
B)   50% of the distribution
C)   66% of the distribution
D)   95% of the distributionE) B) and D)
F) None of the above

Question 5

A linear transformation of data

Accepted Answer

A)   multiplies all scores by a constant and/or adds some constant to all scores.
B)   is illegal.
C)   drastically changes the shape of a distribution.
D)   causes the data to form a straight line.E) All of the above
F) A) and B)

Question 6

Using the distribution in the previous question, calculate z scores for: 
a. X = 11 
b. X = 35 
c. X = 71

Accepted Answer

a. -1.78
...

Question 7

"Abscissa" is to _______ as "ordinate" is to _______.

Accepted Answer

A)   density; frequency
B)   frequency; density
C)   horizontal; vertical
D)   vertical; horizontalE) A) and B)
F) None of the above

Question 8

If behavior problem scores are roughly normally distributed in the population, a sample of behavior problem scores will

Accepted Answer

A)   be normally distributed with any size sample.
B)   more closely resemble a normal distribution as the sample size increases.
C)   have a mean of 0 and a standard deviation of 1.
D)   be negatively skewed.E) All of the above
F) A) and D)

Question 9

The advantage of using T-scores and standard scores is

Accepted Answer

A)   those scores provide a common form of reference to everyone using them.
B)   only negative numbers are used.
C)   the mean is always 10.
D)   scores of -1 and +1 are equal distances from the mean.E) B) and C)
F) A) and D)

Question 10

Transforming a set of data to a new mean and standard deviation using a linear transformation

Accepted Answer

A)   alters the shape of the distribution.
B)   makes the scores harder to work with.
C)   is rarely permissible.
D)   is something we do frequently.E) C) and D)
F) B) and C)

Question 11

The difference between a standard score of -1.0 and a standard score of 1.0 is

Accepted Answer

A)   the standard score 1.0 is farther from the mean than -1.0.
B)   the standard score -1.0 is farther from the mean than 1.0.
C)   the standard score 1.0 is above the mean while -1.0 is below the mean.
D)   the standard score -1.0 is above the mean while 1.0 is below the mean.E) A) and B)
F) A) and C)

Question 12

If the test scores on an art history exam were normally distributed with a mean of 76 and standard deviation of 6, we would expect

Accepted Answer

A)   most students scored around 70.
B)   no one scored 100 on the exam.
C)   almost equal numbers of students scored a 70 and an 82.
D)   both a and cE) A) and B)
F) C) and D)

Question 13

If you are interested in identifying children who are highly aggressive, and you have a normally distributed scale that will do so, you will be particularly interested in

Accepted Answer

A)   scores on that scale that are substantially above the mean.
B)   scores on that scale that are substantially far from the mean.
C)   scores on that scale that are substantially below the mean.
D)   any extreme score.E) A) and B)
F) B) and C)

Question 14

The normal distribution is bimodal and symmetric.

Accepted Answer

A) True 
 B)False

Question 15

The most common situation in statistical procedures is to assume that

Accepted Answer

A)   data are positively skewed.
B)   data are negatively skewed.
C)   data are normally distributed.
D)   it doesn't make any difference what the distribution of the data looks like.E) A) and D)
F) None of the above

Question 16

If behavior problem scores are normally distributed, and we want to say something meaningful about what values are likely and what are unlikely, we would have to know

Accepted Answer

A)   the mean.
B)   the standard deviation.
C)   the sample size.
D)   both a and bE) A) and D)
F) A) and C)

Question 17

Knowing that data are normally distributed allows me to

Accepted Answer

A)   calculate the probability of obtaining a score greater than some specified value.
B)   calculate the probability of obtaining a score of exactly 1.
C)   calculate what range of values are unlikely to occur by chance.
D)   both a and cE) C) and D)
F) A) and C)

Question 18

In a normal distribution, the majority of scores fall beyond plus or minus one standard deviation from the mean.

Accepted Answer

A) True 
 B)False

Question 19

The distribution that is normally distributed with a mean of 0 and a standard deviation of 1 is called

Accepted Answer

A)   the normal distribution.
B)   the standard normal distribution.
C)   the skewed normal distribution.
D)   the ideal normal distribution.E) B) and C)
F) B) and D)

Exam 6: The Normal Distribution

If behavior problem scores are roughly normally distributed in the population, a sample of behavior problem scores will

Correct Answer
verified

A normal distribution

Correct Answer
verified

Knowing that data are normally distributed allows me to

Correct Answer
verified

Which of the following is a good reason to convert data to z scores?

Correct Answer
verified

A linear transformation of data

Correct Answer
verified

If the test scores on an art history exam were normally distributed with a mean of 76 and standard deviation of 6, we would expect

Correct Answer
verified

The advantage of using T-scores and standard scores is

Correct Answer
verified

The distribution that is normally distributed with a mean of 0 and a standard deviation of 1 is called

Correct Answer
verified

Using the distribution in the previous question, calculate z scores for: a. X = 11 b. X = 35 c. X = 71

Correct Answer
verified
a. -1.78
...
View Answer

If behavior problem scores are normally distributed, and we want to say something meaningful about what values are likely and what are unlikely, we would have to know

Correct Answer
verified

A z score of 1.25 represents an observation that is

Correct Answer
verified

If you are interested in identifying children who are highly aggressive, and you have a normally distributed scale that will do so, you will be particularly interested in

Correct Answer
verified

In a normal distribution, the majority of scores fall beyond plus or minus one standard deviation from the mean.

Correct Answer
verified

In a normal distribution, about how much of the distribution lies within two (2) standard deviations of the mean?

Correct Answer
verified

"Abscissa" is to _ as "ordinate" is to _.

Correct Answer
verified

The most common situation in statistical procedures is to assume that

Correct Answer
verified

The normal distribution is bimodal and symmetric.

Correct Answer
verified

Transforming a set of data to a new mean and standard deviation using a linear transformation

Correct Answer
verified

The difference between a standard score of -1.0 and a standard score of 1.0 is

Correct Answer
verified

Exam 6: The Normal Distribution

If behavior problem scores are roughly normally distributed in the population, a sample of behavior problem scores will

Correct AnswerverifiedShow Answer

A normal distribution

Correct AnswerverifiedShow Answer

Knowing that data are normally distributed allows me to

Correct AnswerverifiedShow Answer

Which of the following is a good reason to convert data to z scores?

Correct AnswerverifiedShow Answer

A linear transformation of data

Correct AnswerverifiedShow Answer

If the test scores on an art history exam were normally distributed with a mean of 76 and standard deviation of 6, we would expect

Correct AnswerverifiedShow Answer

The advantage of using T-scores and standard scores is

Correct AnswerverifiedShow Answer

The distribution that is normally distributed with a mean of 0 and a standard deviation of 1 is called

Correct AnswerverifiedShow Answer

Using the distribution in the previous question, calculate z scores for: a. X = 11 b. X = 35 c. X = 71

Correct Answerverifieda. -1.78 ...View AnswerShow Answer

If behavior problem scores are normally distributed, and we want to say something meaningful about what values are likely and what are unlikely, we would have to know

Correct AnswerverifiedShow Answer

A z score of 1.25 represents an observation that is

Correct AnswerverifiedShow Answer

If you are interested in identifying children who are highly aggressive, and you have a normally distributed scale that will do so, you will be particularly interested in

Correct AnswerverifiedShow Answer

In a normal distribution, the majority of scores fall beyond plus or minus one standard deviation from the mean.

Correct AnswerverifiedShow Answer

In a normal distribution, about how much of the distribution lies within two (2) standard deviations of the mean?

Correct AnswerverifiedShow Answer

"Abscissa" is to _______ as "ordinate" is to _______.

Correct AnswerverifiedShow Answer

The most common situation in statistical procedures is to assume that

Correct AnswerverifiedShow Answer

The normal distribution is bimodal and symmetric.

Correct AnswerverifiedShow Answer

Transforming a set of data to a new mean and standard deviation using a linear transformation

Correct AnswerverifiedShow Answer

The difference between a standard score of -1.0 and a standard score of 1.0 is

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a. -1.78
...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

"Abscissa" is to _ as "ordinate" is to _.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified