Question 1

On the normal curve, a point of inflection is

Accepted Answer

A)  the highest point on the curve 
B)  either of the lowest points 
C)  both the highest point on the curve or one of the lowest points 
D)  neither the highest point on the curve nor one of the lowest points. 
A)  the highest point on the curve 
B)  either of the lowest points 
C)  both the highest point on the curve or one of the lowest points 
D)  neither the highest point on the curve nor one of the lowest points. D

Question 2

Suppose a student has a z score of -1. This means she

Accepted Answer

A)  scored well above the mean 
B)  had a negative raw score 
C)  scored 1 standard deviation below the mean 
D)  had the lowest score in the group. 
A)  scored well above the mean 
B)  had a negative raw score 
C)  scored 1 standard deviation below the mean 
D)  had the lowest score in the group. C

Question 3

If you knew that scores were distributed normally and you wanted to find the number of people who scored between 150 and 175, you would need to know

Accepted Answer

A)  the number in the population 
B)  the mean of the population 
C)  the standard deviation of the population 
D)  all of the other alternatives are correct. 
A)  the number in the population 
B)  the mean of the population 
C)  the standard deviation of the population 
D)  all of the other alternatives are correct. D

Question 4

The term normal distribution was adopted because

Accepted Answer

A)  the results were found only with normal, healthy individuals 
B)  Sir Francis Normal was the first to write the equation for the curve 
C)  results were first applied by teachers who had been trained in Teacher's Colleges, which, in those days, were called Normal Schools 
D)  none of the other alternatives are correct. 
A)  the results were found only with normal, healthy individuals 
B)  Sir Francis Normal was the first to write the equation for the curve 
C)  results were first applied by teachers who had been trained in Teacher's Colleges, which, in those days, were called Normal Schools 
D)  none of the other alternatives are correct.

Question 5

Data Set 7-4: A set of scores with a mean of 16 and a standard deviation of 3.
-Look at Data Set 7-4. What proportion of the population has scores between 12 and 17, including both 12 and 17?

Accepted Answer

A)  .2789 
B)  .4962 
C)  .5375 
D)  none of the other alternatives are correct. 
A)  .2789 
B)  .4962 
C)  .5375 
D)  none of the other alternatives are correct.

Question 6

In a normal distribution, if you know the number of standard deviations a score is from the mean, then you know

Accepted Answer

A)  the absolute size of the standard deviation 
B)  the range of the distribution 
C)  the mean of the distribution 
D)  the z score. 
A)  the absolute size of the standard deviation 
B)  the range of the distribution 
C)  the mean of the distribution 
D)  the z score.

Question 7

If an empirical distribution is converted to z scores the new

Accepted Answer

A)  mean will be zero 
B)  standard deviation will be zero 
C)  both of the descriptive alternatives 
D)  neither of the descriptive alternatives. 
A)  mean will be zero 
B)  standard deviation will be zero 
C)  both of the descriptive alternatives 
D)  neither of the descriptive alternatives.

Question 8

For distributions that are not normal distributions

Accepted Answer

A)  Table C cannot be used 
B)  probabilities cannot be calculated 
C)  empirical observations cannot fit a theoretical distribution 
D)  all of the other alternatives are correct. 
A)  Table C cannot be used 
B)  probabilities cannot be calculated 
C)  empirical observations cannot fit a theoretical distribution 
D)  all of the other alternatives are correct.

Question 9

A distribution of playing cards is normally distributed.

Accepted Answer

A) True 
 B)False

Question 10

Data Set 7-4: A set of scores with a mean of 16 and a standard deviation of 3.
-Look at Data Set 7-4. What score separates the top 30 percent of the population from the lower 70 percent?

Accepted Answer

A)  17.80 
B)  18.52 
C)  17.00 
D)  none of the other alternatives are correct. 
A)  17.80 
B)  18.52 
C)  17.00 
D)  none of the other alternatives are correct.

Question 11

Suppose that should k occur, it will be called a success. If j should occur, it will be called a failure. The ratio of k/(k + j) is

Accepted Answer

A)  the empirical probability of k 
B)  the empirical probability of j 
C)  both of the descriptive alternatives 
D)  neither of the descriptive alternatives. 
A)  the empirical probability of k 
B)  the empirical probability of j 
C)  both of the descriptive alternatives 
D)  neither of the descriptive alternatives.

Question 12

Data Set 7-1: Suppose an urn (a kind of jar that seems to be the best natural habitat for marbles) contained 3 red, 6 black, 5 blue, 2 yellow and 4 green marbles.
-Refer to Data Set 7-1. The probability of drawing a black or a green marble is

Accepted Answer

A)  .06 
B)  .40 
C)  .60 
D)  none of the other alternatives are correct 
A)  .06 
B)  .40 
C)  .60 
D)  none of the other alternatives are correct

Question 13

Suppose that should k occur, it will be called a success. If j should occur, it will be called a failure. The ratio of k/(k + j) is

Accepted Answer

A)  the theoretical probability of k 
B)  the empirical probability of k 
C)  both of the descriptive alternatives 
D)  neither of the descriptive alternatives. 
A)  the theoretical probability of k 
B)  the empirical probability of k 
C)  both of the descriptive alternatives 
D)  neither of the descriptive alternatives.

Question 14

Here is a question based on the footnotes in the chapter. Pick the true statement from the four below.

Accepted Answer

A)  The probability of an event is .33 and odds of an event are 3:1 are equivalent statements. 
B)  For statisticians, "the long run" means extensive sampling. 
C)  The empirical probability approach is sometimes referred to as the redactic approach. 
D)  All of the other alternatives are correct. 
A)  The probability of an event is .33 and odds of an event are 3:1 are equivalent statements. 
B)  For statisticians, "the long run" means extensive sampling. 
C)  The empirical probability approach is sometimes referred to as the redactic approach. 
D)  All of the other alternatives are correct.

Question 15

If you knew the proportion of the curve associated with scores of 150-175 and you wanted to know the number of people with such scores, you would need to find out

Accepted Answer

A)  the z scores associated with 150 and 175 
B)  the standard deviation of the population 
C)  the number of people in the population 
D)  something besides the three other alternatives. 
A)  the z scores associated with 150 and 175 
B)  the standard deviation of the population 
C)  the number of people in the population 
D)  something besides the three other alternatives.

Question 16

Graduate Record Exam (GRE) scores for the psychology exam have a mean of 592 and a standard deviation of 101.
a. What proportion of the test takers would have scores of 650 or above?
b. What proportion of the test takers would have scores of 700 or above?
c. What proportion of the test takers would have scores between 650 and 700?
d. If 10,000 took the exam, how many would be expected to have scores of 750 or above?
e. In working these problems, you began with an assumption about the distribution of GRE - psychology scores. What is that assumption?

Accepted Answer

a. @#LAT-DLM& proportion with scores above 650
b @#LAT-DLM&

Question 17

Data Set 7-4: A set of scores with a mean of 16 and a standard deviation of 3.
-Look at Data Set 7-4. Suppose 200 persons received scores during a period of a week. How many would have scores of 15 or larger?

Accepted Answer

A)  15 
B)  100 
C)  45 
D)  none of the other alternatives are correct. 
A)  15 
B)  100 
C)  45 
D)  none of the other alternatives are correct.

Question 18

Data Set 7-5: Suppose you knew that a population had a mean of 150 and a standard deviation of 50.
-Look at Data Set 7-5. To use Table C in the back of your text, you must assume that

Accepted Answer

A)  the population was a theoretical one 
B)  the population was normally distributed 
C)  the highest score possible is 300 
D)  all of the other alternatives are correct. 
A)  the population was a theoretical one 
B)  the population was normally distributed 
C)  the highest score possible is 300 
D)  all of the other alternatives are correct.

Question 19

The place where the normal curve is the steepest (most vertical) is called the point.

Accepted Answer

A)  inflection 
B)  binomial 
C)  asymptotic 
D)  skewed. 
A)  inflection 
B)  binomial 
C)  asymptotic 
D)  skewed.

Question 20

The total area under a theoretical distribution is

Accepted Answer

A)  1.00 
B)  dependent upon the number of events 
C)  dependent upon the mean 
D)  dependent upon the mean, standard deviation, and number of events. 
A)  1.00 
B)  dependent upon the number of events 
C)  dependent upon the mean 
D)  dependent upon the mean, standard deviation, and number of events.

On the normal curve, a point of inflection is

Suppose a student has a z score of -1. This means she

If you knew that scores were distributed normally and you wanted to find the number of people who scored between 150 and 175, you would need to know

The term normal distribution was adopted because

Data Set 7-4: A set of scores with a mean of 16 and a standard deviation of 3. -Look at Data Set 7-4. What proportion of the population has scores between 12 and 17, including both 12 and 17?

In a normal distribution, if you know the number of standard deviations a score is from the mean, then you know

If an empirical distribution is converted to z scores the new

For distributions that are not normal distributions

A distribution of playing cards is normally distributed.

Data Set 7-4: A set of scores with a mean of 16 and a standard deviation of 3. -Look at Data Set 7-4. What score separates the top 30 percent of the population from the lower 70 percent?

Suppose that should k occur, it will be called a success. If j should occur, it will be called a failure. The ratio of k/(k + j) is

Data Set 7-1: Suppose an urn (a kind of jar that seems to be the best natural habitat for marbles) contained 3 red, 6 black, 5 blue, 2 yellow and 4 green marbles. -Refer to Data Set 7-1. The probability of drawing a black or a green marble is

Suppose that should k occur, it will be called a success. If j should occur, it will be called a failure. The ratio of k/(k + j) is

Here is a question based on the footnotes in the chapter. Pick the true statement from the four below.

If you knew the proportion of the curve associated with scores of 150-175 and you wanted to know the number of people with such scores, you would need to find out

Data Set 7-4: A set of scores with a mean of 16 and a standard deviation of 3. -Look at Data Set 7-4. Suppose 200 persons received scores during a period of a week. How many would have scores of 15 or larger?

Data Set 7-5: Suppose you knew that a population had a mean of 150 and a standard deviation of 50. -Look at Data Set 7-5. To use Table C in the back of your text, you must assume that

The place where the normal curve is the steepest (most vertical) is called the point.

The total area under a theoretical distribution is

Introduction

Exploring Data: Frequency Distributions and Graphs

Exploring Data: Central Tendency

Exploring Data: Variability

Other Descriptive Statistics

Correlation and Regression

Samples, Sampling Distributions, and Confidence Intervals

Hypothesis Testing and Effect Size: One-Sample Designs

Hypothesis Testing, Effect Size, and and Confidence Intervals: Two-Sample Designs

Analysis of Variance: One-Way Classification

Analysis of Variance: One-Factor Repeated Measures

Analysis of Variance: Factorial Design

Chi Square Tests

More Nonparametric Tests

Appendix: Grouped Frequency Distributions and Central Tendency

Filters

Exam 7: Theoretical Distributions Including the Normal Distribution

On the normal curve, a point of inflection is

Suppose a student has a z score of -1. This means she

If you knew that scores were distributed normally and you wanted to find the number of people who scored between 150 and 175, you would need to know

The term normal distribution was adopted because

Data Set 7-4: A set of scores with a mean of 16 and a standard deviation of 3. -Look at Data Set 7-4. What proportion of the population has scores between 12 and 17, including both 12 and 17?

In a normal distribution, if you know the number of standard deviations a score is from the mean, then you know

If an empirical distribution is converted to z scores the new

For distributions that are not normal distributions

A distribution of playing cards is normally distributed.

Data Set 7-4: A set of scores with a mean of 16 and a standard deviation of 3. -Look at Data Set 7-4. What score separates the top 30 percent of the population from the lower 70 percent?

Suppose that should k occur, it will be called a success. If j should occur, it will be called a failure. The ratio of k/(k + j) is

Data Set 7-1: Suppose an urn (a kind of jar that seems to be the best natural habitat for marbles) contained 3 red, 6 black, 5 blue, 2 yellow and 4 green marbles. -Refer to Data Set 7-1. The probability of drawing a black or a green marble is

Suppose that should k occur, it will be called a success. If j should occur, it will be called a failure. The ratio of k/(k + j) is

Here is a question based on the footnotes in the chapter. Pick the true statement from the four below.

If you knew the proportion of the curve associated with scores of 150-175 and you wanted to know the number of people with such scores, you would need to find out

Data Set 7-4: A set of scores with a mean of 16 and a standard deviation of 3. -Look at Data Set 7-4. Suppose 200 persons received scores during a period of a week. How many would have scores of 15 or larger?

Data Set 7-5: Suppose you knew that a population had a mean of 150 and a standard deviation of 50. -Look at Data Set 7-5. To use Table C in the back of your text, you must assume that

The place where the normal curve is the steepest (most vertical) is called the point.

The total area under a theoretical distribution is

Introduction

Exploring Data: Frequency Distributions and Graphs

Exploring Data: Central Tendency

Exploring Data: Variability

Other Descriptive Statistics

Correlation and Regression

Samples, Sampling Distributions, and Confidence Intervals

Hypothesis Testing and Effect Size: One-Sample Designs

Hypothesis Testing, Effect Size, and and Confidence Intervals: Two-Sample Designs

Analysis of Variance: One-Way Classification

Analysis of Variance: One-Factor Repeated Measures

Analysis of Variance: Factorial Design

Chi Square Tests

More Nonparametric Tests

Appendix: Grouped Frequency Distributions and Central Tendency

Filters