Question 1

A standardized score of 2.22 is interpreted as which one of the following?

Accepted Answer

A)  Approximately 2.25% of the distribution is right of the mean. 
B)  The mean is 2.22. 
C)  The score is approximately 2 and 1/4 standard deviation units to the right of the mean. 
D)  The standard deviation is 2.22. 
A)  Approximately 2.25% of the distribution is right of the mean. 
B)  The mean is 2.22. 
C)  The score is approximately 2 and 1/4 standard deviation units to the right of the mean. 
D)  The standard deviation is 2.22. C

Question 2

Which of the following represents the interpretation of a standardized score of -1.5?

Accepted Answer

A)  One and one-half percent (1.5%) of the scores are left of the mean. 
B)  One and one-half percent (1.5%) of the scores are right of the mean. 
C)  The score is 1.5 standard deviation units from the mean. 
D)  The standard deviation of the variable is 1.5. 
A)  One and one-half percent (1.5%) of the scores are left of the mean. 
B)  One and one-half percent (1.5%) of the scores are right of the mean. 
C)  The score is 1.5 standard deviation units from the mean. 
D)  The standard deviation of the variable is 1.5. C

Question 3

Which of the following is indicative of a distribution that has a skew value of +18.90?

Accepted Answer

A)  A distribution that when split down the middle is an exact mirror image of itself. 
B)  A left tail that is substantially pulled to the left. 
C)  A right tail that is substantially pulled to the right. 
D)  A very peaked distribution. 
E)  A very flat distribution. 
A)  A distribution that when split down the middle is an exact mirror image of itself. 
B)  A left tail that is substantially pulled to the left. 
C)  A right tail that is substantially pulled to the right. 
D)  A very peaked distribution. 
E)  A very flat distribution. C

Question 4

The population mean of a distribution that is approximately normal is 500 and the population standard deviation is 100. What is the mean of the standardized distribution for this variable?

Accepted Answer

A)  0 
B)  10 
C)  100 
D)  500 
E)  Cannot be determined from this information 
A)  0 
B)  10 
C)  100 
D)  500 
E)  Cannot be determined from this information

Question 5

Weights (in pounds and ounces) of newborns ranges from 3 pounds 7 ounces to 8 pounds 14 ounces. Most of the weights of newborns bunch together between mid-seven to mid-eight pounds. What does this suggest in terms of the shape of the distribution?

Accepted Answer

A)  Negative kurtosis 
B)  Negative skewness 
C)  Positive kurtosis 
D)  Positive skewness 
A)  Negative kurtosis 
B)  Negative skewness 
C)  Positive kurtosis 
D)  Positive skewness

Question 6

What is the proportion of the area below z = +1.10 assuming a normal distribution and referring to the table for N(0,1)?

Accepted Answer

The answer of What is the proportion of the area...

Question 7

A distribution of 400 scores is approximately normally distributed. The mean of the distribution is 50 and the standard deviation is 10. What percentage of scores are less than a value of 30?

Accepted Answer

A)  about 2.5% 
B)  about 16% 
C)  about 34% 
D)  about 50% 
A)  about 2.5% 
B)  about 16% 
C)  about 34% 
D)  about 50%

Question 8

What is the 80th percentile of a distribution that is approximately normally distributed with a population mean of 75 and variance of 16?

Accepted Answer

A)  Approximately 72% 
B)  Approximately 78% 
C)  Approximately 84% 
D)  Approximately 95% 
A)  Approximately 72% 
B)  Approximately 78% 
C)  Approximately 84% 
D)  Approximately 95%

Question 9

After completion of a training program, scores on the satisfaction survey are standardized. The following reflect the standardized results for each component of the satisfaction survey: a) satisfaction with the physical environment, .86; b) satisfaction with the material presented, 2.70; c) satisfaction with the handouts, 1.37; and d) satisfaction with the facilitator, 3.25. Which aspect of satisfaction is farthest from the average?

Accepted Answer

A)  satisfaction with the physical environment 
B)  satisfaction with the material presented 
C)  satisfaction with the handouts 
D)  satisfaction with the facilitator 
A)  satisfaction with the physical environment 
B)  satisfaction with the material presented 
C)  satisfaction with the handouts 
D)  satisfaction with the facilitator

Question 10

A distribution of a continuous variable is extremely peaked. Which of the following would you expect to find given the shape of the distribution?

Accepted Answer

A)  positive skewness statistic 
B)  negative skewness statistic 
C)  a positive kurtosis statistic 
D)  a negative kurtosis statistic 
A)  positive skewness statistic 
B)  negative skewness statistic 
C)  a positive kurtosis statistic 
D)  a negative kurtosis statistic

Question 11

A distribution has a mean of $25,000 and a standard deviation of $5,000. Which of the following is correct based on applying the Empirical Rule?

Accepted Answer

A)  About 68% of the distribution is between $20,000 and $30,000. 
B)  About 95% of the distribution is between $20,000 and $30,000. 
C)  About 95% of the distibution is between $15,000 and $40,000. 
D)  All of the values fall between $10,000 and $40,000. 
A)  About 68% of the distribution is between $20,000 and $30,000. 
B)  About 95% of the distribution is between $20,000 and $30,000. 
C)  About 95% of the distibution is between $15,000 and $40,000. 
D)  All of the values fall between $10,000 and $40,000.

Question 12

A distribution is approximately normal with a population mean of 80 and population standard deviation of 9. Approximately what percentage of scores fall between 71 and 89?

Accepted Answer

A)  About 1/3 
B)  About 2/3 
C)  About 95% 
D)  About 99% 
A)  About 1/3 
B)  About 2/3 
C)  About 95% 
D)  About 99%

Question 13

Which of the following is indicative of a distribution that has a skew value of -14.76?

Accepted Answer

A)  A distribution that when split down the middle is an exact mirror image of itself. 
B)  A left tail that is substantially pulled to the left. 
C)  A right tail that is substantially pulled to the right. 
D)  A very peaked distribution. 
E)  A very flat distribution. 
A)  A distribution that when split down the middle is an exact mirror image of itself. 
B)  A left tail that is substantially pulled to the left. 
C)  A right tail that is substantially pulled to the right. 
D)  A very peaked distribution. 
E)  A very flat distribution.

Question 14

Apply the Empirical Rule to a distribution that has a mean of 275 and a standard deviation of 36. Which one of the following is correct?

Accepted Answer

A)  About 34% of the distribution is between 239 and 311. 
B)  About 68% of the distribution is between 275 and 311. 
C)  About 95% of the distribution is between 203 and 347. 
D)  All of the distribution is between 167 and 383. 
A)  About 34% of the distribution is between 239 and 311. 
B)  About 68% of the distribution is between 275 and 311. 
C)  About 95% of the distribution is between 203 and 347. 
D)  All of the distribution is between 167 and 383.

Question 15

What is the proportion of the area below z = +.86 assuming a normal distribution and referring to the table for N(0,1)?

Accepted Answer

The answer of What is the proportion of the area...

Question 16

Applying the Empirical Rule to a distribution with a mean of 80 and standard deviation of 5, which one of the following is correct?

Accepted Answer

A)  About 34% of the values are located between 80 and 90. 
B)  About 95% of the values are between 70 and 90. 
C)  About 75% of the values are between 75 and 85. 
D)  All values fall between 65 and 95. 
A)  About 34% of the values are located between 80 and 90. 
B)  About 95% of the values are between 70 and 90. 
C)  About 75% of the values are between 75 and 85. 
D)  All values fall between 65 and 95.

Question 17

Which of the following would be found with a platykurtic distribution?

Accepted Answer

A)  a positive skewness statistic 
B)  a negative skewness statistic 
C)  a positive kurtosis statistic 
D)  a negative kurtosis statistic 
A)  a positive skewness statistic 
B)  a negative skewness statistic 
C)  a positive kurtosis statistic 
D)  a negative kurtosis statistic

Question 18

What is the percentile rank of the score 95 in N(90,100)?

Accepted Answer

The percentile rank

Question 19

Which one of the following is a correct statement based on a distribution with a mean of 750 and standard deviation of 25?

Accepted Answer

A)  About 2.5% of the scores in the distribution are greater than 675. 
B)  About 50% of the scores in the distribution are less than 725. 
C)  About 84% of the scores in the distribution are less than 775. 
D)  About 95% of the scores in the distribution are less than 700. 
A)  About 2.5% of the scores in the distribution are greater than 675. 
B)  About 50% of the scores in the distribution are less than 725. 
C)  About 84% of the scores in the distribution are less than 775. 
D)  About 95% of the scores in the distribution are less than 700.

Question 20

Which of the following is indicative of a distribution that has a kurtosis value of +7.25?

Accepted Answer

A)  leptokurtic distribution 
B)  mesokurtic distribution 
C)  platykurtic distribution 
D)  positive skewness 
E)  negative skewness 
A)  leptokurtic distribution 
B)  mesokurtic distribution 
C)  platykurtic distribution 
D)  positive skewness 
E)  negative skewness

A standardized score of 2.22 is interpreted as which one of the following?

Which of the following represents the interpretation of a standardized score of -1.5?

Which of the following is indicative of a distribution that has a skew value of +18.90?

The population mean of a distribution that is approximately normal is 500 and the population standard deviation is 100. What is the mean of the standardized distribution for this variable?

Weights (in pounds and ounces) of newborns ranges from 3 pounds 7 ounces to 8 pounds 14 ounces. Most of the weights of newborns bunch together between mid-seven to mid-eight pounds. What does this suggest in terms of the shape of the distribution?

What is the proportion of the area below z = +1.10 assuming a normal distribution and referring to the table for N(0,1)?

A distribution of 400 scores is approximately normally distributed. The mean of the distribution is 50 and the standard deviation is 10. What percentage of scores are less than a value of 30?

What is the 80th percentile of a distribution that is approximately normally distributed with a population mean of 75 and variance of 16?

A distribution of a continuous variable is extremely peaked. Which of the following would you expect to find given the shape of the distribution?

A distribution has a mean of $25,000 and a standard deviation of $5,000. Which of the following is correct based on applying the Empirical Rule?

A distribution is approximately normal with a population mean of 80 and population standard deviation of 9. Approximately what percentage of scores fall between 71 and 89?

Which of the following is indicative of a distribution that has a skew value of -14.76?

Apply the Empirical Rule to a distribution that has a mean of 275 and a standard deviation of 36. Which one of the following is correct?

What is the proportion of the area below z = +.86 assuming a normal distribution and referring to the table for N(0,1)?

Applying the Empirical Rule to a distribution with a mean of 80 and standard deviation of 5, which one of the following is correct?

Which of the following would be found with a platykurtic distribution?

What is the percentile rank of the score 95 in N(90,100)?

Which one of the following is a correct statement based on a distribution with a mean of 750 and standard deviation of 25?

Which of the following is indicative of a distribution that has a kurtosis value of +7.25?

Introduction

Data Representation

Univariate Population Parameters and Sample Statistics

Introduction to Probability and Sample Statistics

Inferences About a Single Mean

Inferences About the Difference Between Two Means

Inferences About Proportions

Inferences About Variances

Bivariate Measures of Association

One-Factor Anova: Fixed-Effects Model

Multiple Comparison Procedures

Factorial Anova: Fixed-Effects Model

One-Factor Fixed-Effects Ancova With Single Covariate

Random- and Mixed-Effects Analysis of Variance Models

Hierarchical and Randomized Block Analysis of Variance Models

Simple Linear Regression

Multiple Regression

Logistic Regression

Filters

Exam 4: Normal Distribution and Standard Scores

A standardized score of 2.22 is interpreted as which one of the following?

Which of the following represents the interpretation of a standardized score of -1.5?

Which of the following is indicative of a distribution that has a skew value of +18.90?

The population mean of a distribution that is approximately normal is 500 and the population standard deviation is 100. What is the mean of the standardized distribution for this variable?

Weights (in pounds and ounces) of newborns ranges from 3 pounds 7 ounces to 8 pounds 14 ounces. Most of the weights of newborns bunch together between mid-seven to mid-eight pounds. What does this suggest in terms of the shape of the distribution?

What is the proportion of the area below z = +1.10 assuming a normal distribution and referring to the table for N(0,1)?

A distribution of 400 scores is approximately normally distributed. The mean of the distribution is 50 and the standard deviation is 10. What percentage of scores are less than a value of 30?

What is the 80th percentile of a distribution that is approximately normally distributed with a population mean of 75 and variance of 16?

A distribution of a continuous variable is extremely peaked. Which of the following would you expect to find given the shape of the distribution?

A distribution has a mean of $25,000 and a standard deviation of $5,000. Which of the following is correct based on applying the Empirical Rule?

A distribution is approximately normal with a population mean of 80 and population standard deviation of 9. Approximately what percentage of scores fall between 71 and 89?

Which of the following is indicative of a distribution that has a skew value of -14.76?

Apply the Empirical Rule to a distribution that has a mean of 275 and a standard deviation of 36. Which one of the following is correct?

What is the proportion of the area below z = +.86 assuming a normal distribution and referring to the table for N(0,1)?

Applying the Empirical Rule to a distribution with a mean of 80 and standard deviation of 5, which one of the following is correct?

Which of the following would be found with a platykurtic distribution?

What is the percentile rank of the score 95 in N(90,100)?

Which one of the following is a correct statement based on a distribution with a mean of 750 and standard deviation of 25?

Which of the following is indicative of a distribution that has a kurtosis value of +7.25?

Introduction

Data Representation

Univariate Population Parameters and Sample Statistics

Introduction to Probability and Sample Statistics

Inferences About a Single Mean

Inferences About the Difference Between Two Means

Inferences About Proportions

Inferences About Variances

Bivariate Measures of Association

One-Factor Anova: Fixed-Effects Model

Multiple Comparison Procedures

Factorial Anova: Fixed-Effects Model

One-Factor Fixed-Effects Ancova With Single Covariate

Random- and Mixed-Effects Analysis of Variance Models

Hierarchical and Randomized Block Analysis of Variance Models

Simple Linear Regression

Multiple Regression

Logistic Regression

Filters