Question 1

The mean of a set of z scores is

Accepted Answer

A)  1 
B)  0 
C)  indeterminate 
D)  the same as the mean of raw scores from which the z scores were derived 
A)  1 
B)  0 
C)  indeterminate 
D)  the same as the mean of raw scores from which the z scores were derived

Question 2

We calculate SX to be -6. We know

Accepted Answer

A)    
B)      = 6 
C)  we have made an error in computation 
D)    
A)    
B)      = 6 
C)  we have made an error in computation 
D)

Question 3

Each score in a sample of five raw scores is converted to a deviation score. The following are the values for four of the deviation scores: -4, +2, +3, -6. What is the value of the remaining deviation score?

Accepted Answer

The answer of Each score in a sample of five...

Question 4

The semi-interquartile range is most closely related to the

Accepted Answer

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

Question 5

A set of scores has a standard deviation of 20. If 4 points were added to each score, the standard deviation would be

Accepted Answer

A)  36 
B)  24 
C)  22 
D)  20 
A)  36 
B)  24 
C)  22 
D)  20

Question 6

For the two scores 4 and 8,   
 is

Accepted Answer

A)  8 
B)  4 
C)  0 
D)  -2 
A)  8 
B)  4 
C)  0 
D)  -2

Question 7

If a set of raw scores is positively skewed, the set of z scores derived from them will be

Accepted Answer

A)  positively skewed 
B)  very close to a normal distribution, but slightly positively skewed 
C)  symmetrical, but not normal 
D)  normally distributed 
A)  positively skewed 
B)  very close to a normal distribution, but slightly positively skewed 
C)  symmetrical, but not normal 
D)  normally distributed

Question 8

In a normal distribution, the interscore distance would be

Accepted Answer

A)  greatest for the interval   
B)  greatest for the interval   
C)  greatest for the interval   
D)  the same for all of the above intervals 
A)  greatest for the interval   
B)  greatest for the interval   
C)  greatest for the interval   
D)  the same for all of the above intervals

Question 9

For the distribution of scores on a test of introversion-extroversion administered to a large group of college students, $ \bar{X}=82 $ and $ S_{X}=12 $
 (high scores are in the direction of introversion). For each of the following students, convert the raw score to a z score:
(a)John, 88;
(b)George, 96;
(c)Mary, 72;
(d)Alfred, 64.

Accepted Answer

(a)+.5
(b)

Question 10

is

Accepted Answer

A)  the average deviation 
B)  the standard deviation 
C)  the variance 
D)  none of the above 
A)  the average deviation 
B)  the standard deviation 
C)  the variance 
D)  none of the above

Question 11

Eliminating some scores from a point near the mean will

Accepted Answer

A)  not affect the standard deviation 
B)  increase the standard deviation 
C)  decrease the standard deviation 
D)  affect the standard deviation in an unpredictable way 
A)  not affect the standard deviation 
B)  increase the standard deviation 
C)  decrease the standard deviation 
D)  affect the standard deviation in an unpredictable way

Question 12

The scores of two groups of chimpanzees on a special problem-solving task are as follows. Group 1: 2, 7, 5, 2, 3, 8, 3. Group 2: 5, 9, 8, 5, 3. (a)Compute the standard deviations of both sets of scores, directly from deviation scores. Carry any remainders to two decimal places. (b)Compute the standard deviations of both sets of scores, using the raw score formula to obtain

Accepted Answer

(a) and (b

Question 13

The major disadvantage of percentile ranks as a kind of derived score is that

Accepted Answer

A)  they are not readily intelligible to the public 
B)  they cannot be determined accurately 
C)  they are suitable only when distribution is normal 
D)  changes in raw scores are not necessarily reflected by proportionate changes in percentile ranks 
A)  they are not readily intelligible to the public 
B)  they cannot be determined accurately 
C)  they are suitable only when distribution is normal 
D)  changes in raw scores are not necessarily reflected by proportionate changes in percentile ranks

Question 14

The properties of the standard deviation are most closely related to those of the

Accepted Answer

A)  mean 
B)  median 
C)  mode 
D)  mean or median, depending on the shape of the distribution 
A)  mean 
B)  median 
C)  mode 
D)  mean or median, depending on the shape of the distribution

Question 15

For the frequency distribution of GPA's of a group of freshmen,   
 and 
   
. 75% of the freshmen's GPA's fall below

Accepted Answer

A)  3.25 
B)  3.35 
C)  3.45 
D)  can't tell unless the distribution is symmetric 
A)  3.25 
B)  3.35 
C)  3.45 
D)  can't tell unless the distribution is symmetric

Question 16

Use the basic definition of z scores to convert each of the following z scores back to introversion-extroversion scores from the distribution of Problem 8 (round answers to the nearest whole number):
(a)0;
(b)-2.10;
(c)1.82;
(d)-.75;
(e).25;
(f)3.10.

Accepted Answer

(a)82
(b)5

Question 17

If the lowest score is 51 and the highest score is 92, the range is

Accepted Answer

A)  41 
B)  42 
C)  40.5 
D)  41.1 
A)  41 
B)  42 
C)  40.5 
D)  41.1

The mean of a set of z scores is

We calculate S_X to be -6. We know

Each score in a sample of five raw scores is converted to a deviation score. The following are the values for four of the deviation scores: -4, +2, +3, -6. What is the value of the remaining deviation score?

The semi-interquartile range is most closely related to the

A set of scores has a standard deviation of 20. If 4 points were added to each score, the standard deviation would be

For the two scores 4 and 8, is

If a set of raw scores is positively skewed, the set of z scores derived from them will be

In a normal distribution, the interscore distance would be

is

Eliminating some scores from a point near the mean will

The major disadvantage of percentile ranks as a kind of derived score is that

The properties of the standard deviation are most closely related to those of the

For the frequency distribution of GPA's of a group of freshmen, and . 75% of the freshmen's GPA's fall below

Use the basic definition of z scores to convert each of the following z scores back to introversion-extroversion scores from the distribution of Problem 8 (round answers to the nearest whole number): (a)0; (b)-2.10; (c)1.82; (d)-.75; (e).25; (f)3.10.

If the lowest score is 51 and the highest score is 92, the range is

Introduction

Frequency Distributions, Percentiles,

Graphic Representation of Frequency Distributions

Central Tendency

Standard Scores and the Normal Curve

Correlation

Prediction

Interpretive Aspects of Correlation and Regression

Probability

Random Sampling and Sampling Distributions

Introduction to Statistical Inference: Testing Hypotheses About Single Means Z and T

Interpreting the Results of Hypothesis Testing: Effect Size, Type I and Type II Errors, and Power

Testing Hypotheses About the Difference Between Two Independent Groups

Testing for a Difference

Inference About Correlation Coefficients

An Alternative to Hypothesis Testing: Confidence Intervals

Testing for Differences Among Three or More Groups: One-Way Analysis of Variance and Some Alternatives

Factorial Analysis of Variance

Chi-Square and Inference About Frequencies

Some Almost Assumption-Free Tests

Filters

Exam 5: Variability and Standard Z Scores

The mean of a set of z scores is

We calculate SX to be -6. We know

Each score in a sample of five raw scores is converted to a deviation score. The following are the values for four of the deviation scores: -4, +2, +3, -6. What is the value of the remaining deviation score?

The semi-interquartile range is most closely related to the

A set of scores has a standard deviation of 20. If 4 points were added to each score, the standard deviation would be

For the two scores 4 and 8, is

If a set of raw scores is positively skewed, the set of z scores derived from them will be

In a normal distribution, the interscore distance would be

is

Eliminating some scores from a point near the mean will

The major disadvantage of percentile ranks as a kind of derived score is that

The properties of the standard deviation are most closely related to those of the

For the frequency distribution of GPA's of a group of freshmen, and . 75% of the freshmen's GPA's fall below

Use the basic definition of z scores to convert each of the following z scores back to introversion-extroversion scores from the distribution of Problem 8 (round answers to the nearest whole number): (a)0; (b)-2.10; (c)1.82; (d)-.75; (e).25; (f)3.10.

If the lowest score is 51 and the highest score is 92, the range is

Introduction

Frequency Distributions, Percentiles,

Graphic Representation of Frequency Distributions

Central Tendency

Standard Scores and the Normal Curve

Correlation

Prediction

Interpretive Aspects of Correlation and Regression

Probability

Random Sampling and Sampling Distributions

Introduction to Statistical Inference: Testing Hypotheses About Single Means Z and T

Interpreting the Results of Hypothesis Testing: Effect Size, Type I and Type II Errors, and Power

Testing Hypotheses About the Difference Between Two Independent Groups

Testing for a Difference

Inference About Correlation Coefficients

An Alternative to Hypothesis Testing: Confidence Intervals

Testing for Differences Among Three or More Groups: One-Way Analysis of Variance and Some Alternatives

Factorial Analysis of Variance

Chi-Square and Inference About Frequencies

Some Almost Assumption-Free Tests

Filters

We calculate S_X to be -6. We know