Question 1

According to the central limit theorem,the sampling distribution of means always approximates a ______ distribution.

Accepted Answer

A) normal 
B) positively skewed 
C) negatively skewed 
D) bimodal 
A) normal 
B) positively skewed 
C) negatively skewed 
D) bimodal

Question 2

Given a normal distribution,as z-scores' absolute values increase,those z-scores and the raw scores that correspond to them occur

Accepted Answer

A) more frequently. 
B) less frequently. 
C) more frequently at first and then less frequently. 
D) less frequently at first and then more frequently. 
A) more frequently. 
B) less frequently. 
C) more frequently at first and then less frequently. 
D) less frequently at first and then more frequently.

Question 3

Using the appropriate values from the z-table in the textbook appendix,find the area above (beyond)z = +0.89.

Accepted Answer

A) 0.3133 
B) 0.1867 
C) -0.3133 
D) -0.1867 
A) 0.3133 
B) 0.1867 
C) -0.3133 
D) -0.1867

Question 4

The proportion of the total area under a normal curve between two z-scores corresponds to the ______ of that range of scores.

Accepted Answer

A) numeric magnitude 
B) variability 
C) frequency 
D) relative frequency 
A) numeric magnitude 
B) variability 
C) frequency 
D) relative frequency

Question 5

An evaluation of where a score is located in relation to the other scores in the distribution reflects its

Accepted Answer

A) absolute value. 
B) relative standing. 
C) standard deviation. 
D) frequency. 
A) absolute value. 
B) relative standing. 
C) standard deviation. 
D) frequency.

Question 6

The mean of a z-score distribution is always ______,and the standard deviation is always ______.

Accepted Answer

A) 0;10 
B) 1;0 
C) 100;20 
D) 0;1 
A) 0;10 
B) 1;0 
C) 100;20 
D) 0;1

Question 7

The size of   depends on

Accepted Answer

A)    and   
B) N and   
C)    and   
D) z and   
A)    and   
B) N and   
C)    and   
D) z and

Question 8

If a school's z-score for its sample mean was +3,its percentile rank in the state was

Accepted Answer

A) 99.87%. 
B) 90.87%. 
C) 85.87%. 
D) 95.87%. 
A) 99.87%. 
B) 90.87%. 
C) 85.87%. 
D) 95.87%.

Question 9

Pat's last statistics test score was 72.If the instructor tells Pat that the grade distribution was approximately normal,the class mean was 67,and the standard deviation was 3,which of the following is correct?

Accepted Answer

A) A score of 72 is never good. 
B) Pat should be worried about this score,because many other students did better. 
C) Pat should be fairly happy about this score,because many students did not do as well. 
D) Pat should be ecstatic,because this is obviously one of the highest grades in the class. 
A) A score of 72 is never good. 
B) Pat should be worried about this score,because many other students did better. 
C) Pat should be fairly happy about this score,because many students did not do as well. 
D) Pat should be ecstatic,because this is obviously one of the highest grades in the class.

Question 10

The sample mean for a recent introductory psychology test was 78 and the sample variance was 9.Approximately what proportion of the scores was above 81?

Accepted Answer

A) 0.50 
B) 0.68 
C) 0.16 
D) 0.34 
A) 0.50 
B) 0.68 
C) 0.16 
D) 0.34

Question 11

The sample mean for a recent introductory psychology test was 78,and the sample variance was 9.If a student received a score of 82,what was this student's z-score?

Accepted Answer

A) 0.44 
B) 1.33 
C) -1.33 
D) -0.44 
A) 0.44 
B) 1.33 
C) -1.33 
D) -0.44

Question 12

The mean of the sampling distribution of means is always

Accepted Answer

A) greater than the population mean. 
B) less than the population mean. 
C) equal to the population mean. 
D) the population mean divided by the square root of N. 
A) greater than the population mean. 
B) less than the population mean. 
C) equal to the population mean. 
D) the population mean divided by the square root of N.

Question 13

z-scores communicate a score's

Accepted Answer

A) absolute magnitude. 
B) relative standing in a distribution. 
C) distance from the population mean. 
D) variability. 
A) absolute magnitude. 
B) relative standing in a distribution. 
C) distance from the population mean. 
D) variability.

Question 14

Which of the following is NOT a way we apply the standard normal curve?

Accepted Answer

A) finding relative frequency 
B) measuring variability 
C) finding simple frequency 
D) calculating the raw score for a specific percentile 
A) finding relative frequency 
B) measuring variability 
C) finding simple frequency 
D) calculating the raw score for a specific percentile

Question 15

For a distribution with   = 50 and   = 5,find the raw scores for the following z-scores: -1.2;-0.5;1.7;2.6

Accepted Answer

A) 44.00;47.50;58.50;63.00 
B) 20.00;37.50;92.50;115.00 
C) 47.32;48.88;53.80;55.81 
D) -20.00;-37.50;92.50;115.00 
A) 44.00;47.50;58.50;63.00 
B) 20.00;37.50;92.50;115.00 
C) 47.32;48.88;53.80;55.81 
D) -20.00;-37.50;92.50;115.00

Question 16

Alicia scored a 70 on her psychology quiz,but the class as a whole averaged a 40.If the standard deviation was 10,what was Alicia's z-score?

Accepted Answer

A) F1F1F1S1F1F1F103 
B) +3 
C) F1F1F1S1F1F1F100.3 
D) +0.3 
A) F1F1F1S1F1F1F103 
B) +3 
C) F1F1F1S1F1F1F100.3 
D) +0.3

Question 17

What were the sample means that marked the middle 68% in the state if the population mean was 500 and the standard deviation (standard error)for the sampling distribution was 200?

Accepted Answer

A) 350 and 650 
B) 300 and 700 
C) 400 and 600 
D) 450 and 550 
A) 350 and 650 
B) 300 and 700 
C) 400 and 600 
D) 450 and 550

Question 18

If your sense of direction,relative to a sample of college students,gave you a z-score of +1.5,what is your percentile?

Accepted Answer

A) 6th 
B) 7th 
C) 43rd 
D) 93rd 
A) 6th 
B) 7th 
C) 43rd 
D) 93rd

Question 19

Sampling distributions of means are always

Accepted Answer

A) approximately normally distributed. 
B) positively skewed. 
C) negatively skewed. 
D) more variable than the population from which the samples were drawn. 
A) approximately normally distributed. 
B) positively skewed. 
C) negatively skewed. 
D) more variable than the population from which the samples were drawn.

Question 20

The absolute value of a number is the

Accepted Answer

A) measure of how much the number is worth. 
B) size of a number only when it is a positive number. 
C) size of a number only when it is a negative number. 
D) size of a number,regardless of whether it is positive or negative. 
A) measure of how much the number is worth. 
B) size of a number only when it is a positive number. 
C) size of a number only when it is a negative number. 
D) size of a number,regardless of whether it is positive or negative.

According to the central limit theorem,the sampling distribution of means always approximates a ______ distribution.

Given a normal distribution,as z-scores' absolute values increase,those z-scores and the raw scores that correspond to them occur

Using the appropriate values from the z-table in the textbook appendix,find the area above (beyond)z = +0.89.

The proportion of the total area under a normal curve between two z-scores corresponds to the ______ of that range of scores.

An evaluation of where a score is located in relation to the other scores in the distribution reflects its

The mean of a z-score distribution is always ,and the standard deviation is always .

The size of depends on

If a school's z-score for its sample mean was +3,its percentile rank in the state was

Pat's last statistics test score was 72.If the instructor tells Pat that the grade distribution was approximately normal,the class mean was 67,and the standard deviation was 3,which of the following is correct?

The sample mean for a recent introductory psychology test was 78 and the sample variance was 9.Approximately what proportion of the scores was above 81?

The sample mean for a recent introductory psychology test was 78,and the sample variance was 9.If a student received a score of 82,what was this student's z-score?

The mean of the sampling distribution of means is always

z-scores communicate a score's

Which of the following is NOT a way we apply the standard normal curve?

For a distribution with = 50 and = 5,find the raw scores for the following z-scores: -1.2;-0.5;1.7;2.6

Alicia scored a 70 on her psychology quiz,but the class as a whole averaged a 40.If the standard deviation was 10,what was Alicia's z-score?

What were the sample means that marked the middle 68% in the state if the population mean was 500 and the standard deviation (standard error)for the sampling distribution was 200?

If your sense of direction,relative to a sample of college students,gave you a z-score of +1.5,what is your percentile?

Sampling distributions of means are always

The absolute value of a number is the

Introduction to Statistics

Statistics and the Research Process

Frequency Distributions and Percentiles

Measures of Central Tendency;the Mean, median, and Mode

Measures of Variability: Range, variance, and Standard Deviation

The Correlation Coefficient

Linear Regression

Using Probability to Make Decisions About Data

Introduction to Hypothesis Testing

Performing the One-Sample T-Test and Testing Correlation Coefficients

The Two-Sample T-Test

The One-Way Analysis of Variance

The Two-Way Analysis of Variance

Chi Square and Other Nonparametric Procedures

Filters

Exam 6: Z-Scores and the Normal Curve

According to the central limit theorem,the sampling distribution of means always approximates a ______ distribution.

Given a normal distribution,as z-scores' absolute values increase,those z-scores and the raw scores that correspond to them occur

Using the appropriate values from the z-table in the textbook appendix,find the area above (beyond)z = +0.89.

The proportion of the total area under a normal curve between two z-scores corresponds to the ______ of that range of scores.

An evaluation of where a score is located in relation to the other scores in the distribution reflects its

The mean of a z-score distribution is always ______,and the standard deviation is always ______.

The size of depends on

If a school's z-score for its sample mean was +3,its percentile rank in the state was

Pat's last statistics test score was 72.If the instructor tells Pat that the grade distribution was approximately normal,the class mean was 67,and the standard deviation was 3,which of the following is correct?

The sample mean for a recent introductory psychology test was 78 and the sample variance was 9.Approximately what proportion of the scores was above 81?

The sample mean for a recent introductory psychology test was 78,and the sample variance was 9.If a student received a score of 82,what was this student's z-score?

The mean of the sampling distribution of means is always

z-scores communicate a score's

Which of the following is NOT a way we apply the standard normal curve?

For a distribution with = 50 and = 5,find the raw scores for the following z-scores: -1.2;-0.5;1.7;2.6

Alicia scored a 70 on her psychology quiz,but the class as a whole averaged a 40.If the standard deviation was 10,what was Alicia's z-score?

What were the sample means that marked the middle 68% in the state if the population mean was 500 and the standard deviation (standard error)for the sampling distribution was 200?

If your sense of direction,relative to a sample of college students,gave you a z-score of +1.5,what is your percentile?

Sampling distributions of means are always

The absolute value of a number is the

Introduction to Statistics

Statistics and the Research Process

Frequency Distributions and Percentiles

Measures of Central Tendency;the Mean, median, and Mode

Measures of Variability: Range, variance, and Standard Deviation

The Correlation Coefficient

Linear Regression

Using Probability to Make Decisions About Data

Introduction to Hypothesis Testing

Performing the One-Sample T-Test and Testing Correlation Coefficients

The Two-Sample T-Test

The One-Way Analysis of Variance

The Two-Way Analysis of Variance

Chi Square and Other Nonparametric Procedures

Filters

The mean of a z-score distribution is always ,and the standard deviation is always .