Question 1

The Z scores of two tests scores are +1.2 and +1.5.To obtain the area between these scores,

Accepted Answer

A) subtract the Z scores and find the area of the difference in the Z score table. 
B) find the area between each score and the mean in the Z score table and then subtract the smaller area from the larger area. 
C) find the area between each score and the mean in the Z score table and then subtract the difference between them from 100%. 
D) find the area beyond each score in the Z score table and subtract the difference between the areas from the mean. 
A) subtract the Z scores and find the area of the difference in the Z score table. 
B) find the area between each score and the mean in the Z score table and then subtract the smaller area from the larger area. 
C) find the area between each score and the mean in the Z score table and then subtract the difference between them from 100%. 
D) find the area beyond each score in the Z score table and subtract the difference between the areas from the mean. B

Question 2

The Z scores of two test scores are -1.17 and +2.38.To find the total area beyond these two scores,

Accepted Answer

A) add the column b areas together. 
B) subtract each score from the mean and divide the result by the standard deviation. 
C) add the column b area to the column c area. 
D) add the column c areas. 
A) add the column b areas together. 
B) subtract each score from the mean and divide the result by the standard deviation. 
C) add the column b area to the column c area. 
D) add the column c areas. D

Question 3

To find the area above a positive Z score or below a negative Z score you would

Accepted Answer

A) subtract the value of the Z score from the mean. 
B) use the "Area Beyond Z" column of the Z score table. 
C) add the value of the Z score to the area beyond the mean. 
D) add the area between the Z score and the mean to 100%. 
A) subtract the value of the Z score from the mean. 
B) use the "Area Beyond Z" column of the Z score table. 
C) add the value of the Z score to the area beyond the mean. 
D) add the area between the Z score and the mean to 100%. B

Question 4

Converting scores into Z scores standardizes the original distribution to units of the

Accepted Answer

A) median. 
B) standard deviation. 
C) mean. 
D) percentage. 
A) median. 
B) standard deviation. 
C) mean. 
D) percentage.

Question 5

The area beyond$\pm$2 standard deviations contains approximately what % of the area under the normal curve?

Accepted Answer

A) 75% 
B) 50% 
C) 99% 
D) 5% 
A) 75% 
B) 50% 
C) 99% 
D) 5%

Question 6

On all normal curves the area between the mean and $\pm$1 standard deviation will be

Accepted Answer

A) about 34% of the total areA. 
B) about 68% of the total area. 
C) 50% of the total area. 
D) 99.9% of the total area. 
A) about 34% of the total areA. 
B) about 68% of the total area. 
C) 50% of the total area. 
D) 99.9% of the total area.

Question 7

A defining characteristic of the normal curve is that it is

Accepted Answer

A) theoretical. 
B) positively skewed. 
C) negatively skewed. 
D) perfectly nonsymmetrical. 
A) theoretical. 
B) positively skewed. 
C) negatively skewed. 
D) perfectly nonsymmetrical.

Question 8

As the standard deviation of a normal distribution increases,the percentage of the area between$\pm$1 standard deviation will

Accepted Answer

A) increase. 
B) stay the same. 
C) decrease. 
D) become non-symmetrical. 
A) increase. 
B) stay the same. 
C) decrease. 
D) become non-symmetrical.

Question 9

The average homicide rate for the cities and towns in a state is 10 per 100,000 population with a standard deviation of 2.If the variable is normally distributed,what is the probability that a randomly selected town will have a homicide rate greater than 14?

Accepted Answer

A) 0.34 
B) 0.68 
C) 0.50 
D) 0.02 
A) 0.34 
B) 0.68 
C) 0.50 
D) 0.02

Question 10

Assuming a normal distribution of 1000 cases,how many cases will be within$\pm$1 standard deviations of the mean?

Accepted Answer

A) at least 500 
B) about 3 
C) about 680 
D) it's impossible to estimate 
A) at least 500 
B) about 3 
C) about 680 
D) it's impossible to estimate

Question 11

Column c in the normal curve table lists "areas beyond Z." This is the area

Accepted Answer

A) below a positive Z score. 
B) above a negative Z score. 
C) between two positive Z scores. 
D) above a positive Z score. 
A) below a positive Z score. 
B) above a negative Z score. 
C) between two positive Z scores. 
D) above a positive Z score.

Question 12

The mean score on a final chemistry exam was 75,and the standard deviation of the scores was 5.If the distribution is normal and your score was 70,what percentage of the scores was lower than yours?

Accepted Answer

A) 15.87% 
B) 30.00% 
C) 34.13% 
D) 50.00% 
A) 15.87% 
B) 30.00% 
C) 34.13% 
D) 50.00%

Question 13

When an empirical normal distribution of scores is standardized,

Accepted Answer

A) the mean will become 0. 
B) the standard deviation will become 1. 
C) each score will be converted to a Z score. 
D) all of these 
A) the mean will become 0. 
B) the standard deviation will become 1. 
C) each score will be converted to a Z score. 
D) all of these

Question 14

A social researcher has constructed a measure of racial prejudice and obtained a distribution of scores on this measure from a randomly selected sample of public office holders.The scores were normally distributed with a mean of 45 and a standard deviation of 7.What is the probability that a randomly selected case from the sample in the previous question would have a score of 52 or more?

Accepted Answer

A) 0.7500 
B) 0.6826 
C) 0.3413 
D) 0.1587 
A) 0.7500 
B) 0.6826 
C) 0.3413 
D) 0.1587

Question 15

A Z score of +1.00 indicates a score that lies

Accepted Answer

A) one standard deviation unit to the right of the mean. 
B) one standard deviation unit to the left of the mean. 
C) 1/2 of one standard deviation unit on each side of the mean. 
D) Any of these are possible. 
A) one standard deviation unit to the right of the mean. 
B) one standard deviation unit to the left of the mean. 
C) 1/2 of one standard deviation unit on each side of the mean. 
D) Any of these are possible.

Question 16

What is the probability that a randomly selected case from a normally distributed distribution will have a score between -1.00 and the mean?

Accepted Answer

A) 0.34 
B) 0.16 
C) 0.50 
D) 0.86 
A) 0.34 
B) 0.16 
C) 0.50 
D) 0.86

Question 17

To estimate probabilities,set up a fraction with the number of ____ in the numerator and the number of ____ in the denominator

Accepted Answer

A) successes;failures 
B) possible outcomes;successes 
C) failures;successes 
D) successes;possible outcomes 
A) successes;failures 
B) possible outcomes;successes 
C) failures;successes 
D) successes;possible outcomes

Question 18

Assuming a normal distribution of 1000 cases,how many cases will be farther away from the mean than +3 standard deviations?

Accepted Answer

A) at least 500 
B) about 3 
C) 327 
D) It's impossible to estimate. 
A) at least 500 
B) about 3 
C) 327 
D) It's impossible to estimate.

Question 19

By definition,the normal curve is

Accepted Answer

A) symmetrical. 
B) positively skewed. 
C) negatively skewed. 
D) empirical. 
A) symmetrical. 
B) positively skewed. 
C) negatively skewed. 
D) empirical.

Question 20

If a case is randomly selected from a normal distribution,the score of the case will most likely be

Accepted Answer

A) equal to the mean in value. 
B) close to the mean in value. 
C) at least 1 standard deviation above the mean. 
D) at least 1 standard deviation below the mean. 
A) equal to the mean in value. 
B) close to the mean in value. 
C) at least 1 standard deviation above the mean. 
D) at least 1 standard deviation below the mean.

The Z scores of two tests scores are +1.2 and +1.5.To obtain the area between these scores,

The Z scores of two test scores are -1.17 and +2.38.To find the total area beyond these two scores,

To find the area above a positive Z score or below a negative Z score you would

Converting scores into Z scores standardizes the original distribution to units of the

The area beyond $\pm$ 2 standard deviations contains approximately what % of the area under the normal curve?

On all normal curves the area between the mean and $\pm$ 1 standard deviation will be

A defining characteristic of the normal curve is that it is

As the standard deviation of a normal distribution increases,the percentage of the area between $\pm$ 1 standard deviation will

The average homicide rate for the cities and towns in a state is 10 per 100,000 population with a standard deviation of 2.If the variable is normally distributed,what is the probability that a randomly selected town will have a homicide rate greater than 14?

Assuming a normal distribution of 1000 cases,how many cases will be within $\pm$ 1 standard deviations of the mean?

Column c in the normal curve table lists "areas beyond Z." This is the area

The mean score on a final chemistry exam was 75,and the standard deviation of the scores was 5.If the distribution is normal and your score was 70,what percentage of the scores was lower than yours?

When an empirical normal distribution of scores is standardized,

A Z score of +1.00 indicates a score that lies

What is the probability that a randomly selected case from a normally distributed distribution will have a score between -1.00 and the mean?

To estimate probabilities,set up a fraction with the number of in the numerator and the number of in the denominator

Assuming a normal distribution of 1000 cases,how many cases will be farther away from the mean than +3 standard deviations?

By definition,the normal curve is

If a case is randomly selected from a normal distribution,the score of the case will most likely be

Introduction

Basic Descriptive Statistics: Percentages Ratios and Rates Frequency Distributions

Charts and Graphs

Measures of Central Tendency

Measures of Dispersion

Introduction in Inferential Statistics, the Sampling Distribution, and Estimation

Hypothesis Testing I: the One-Sample Case

Hypothesis Testing II: the Two-Sample Case

Hypothesis Testing III: the Analysis of Variance

Hypothesis Testing Iv: Chi Square

Introduction to Bivariate Association and Measures of Association for Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and Multiple Regression and Correlation

Filters

Exam 6: The Normal Curve

The Z scores of two tests scores are +1.2 and +1.5.To obtain the area between these scores,

The Z scores of two test scores are -1.17 and +2.38.To find the total area beyond these two scores,

To find the area above a positive Z score or below a negative Z score you would

Converting scores into Z scores standardizes the original distribution to units of the

The area beyond ±\pm± 2 standard deviations contains approximately what % of the area under the normal curve?

On all normal curves the area between the mean and ±\pm± 1 standard deviation will be

A defining characteristic of the normal curve is that it is

As the standard deviation of a normal distribution increases,the percentage of the area between ±\pm± 1 standard deviation will

The average homicide rate for the cities and towns in a state is 10 per 100,000 population with a standard deviation of 2.If the variable is normally distributed,what is the probability that a randomly selected town will have a homicide rate greater than 14?

Assuming a normal distribution of 1000 cases,how many cases will be within ±\pm± 1 standard deviations of the mean?

Column c in the normal curve table lists "areas beyond Z." This is the area

The mean score on a final chemistry exam was 75,and the standard deviation of the scores was 5.If the distribution is normal and your score was 70,what percentage of the scores was lower than yours?

When an empirical normal distribution of scores is standardized,

A Z score of +1.00 indicates a score that lies

What is the probability that a randomly selected case from a normally distributed distribution will have a score between -1.00 and the mean?

To estimate probabilities,set up a fraction with the number of ____ in the numerator and the number of ____ in the denominator

Assuming a normal distribution of 1000 cases,how many cases will be farther away from the mean than +3 standard deviations?

By definition,the normal curve is

If a case is randomly selected from a normal distribution,the score of the case will most likely be

Introduction

Basic Descriptive Statistics: Percentages Ratios and Rates Frequency Distributions

Charts and Graphs

Measures of Central Tendency

Measures of Dispersion

Introduction in Inferential Statistics, the Sampling Distribution, and Estimation

Hypothesis Testing I: the One-Sample Case

Hypothesis Testing II: the Two-Sample Case

Hypothesis Testing III: the Analysis of Variance

Hypothesis Testing Iv: Chi Square

Introduction to Bivariate Association and Measures of Association for Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and Multiple Regression and Correlation

Filters

The area beyond $\pm$ 2 standard deviations contains approximately what % of the area under the normal curve?

On all normal curves the area between the mean and $\pm$ 1 standard deviation will be

As the standard deviation of a normal distribution increases,the percentage of the area between $\pm$ 1 standard deviation will

Assuming a normal distribution of 1000 cases,how many cases will be within $\pm$ 1 standard deviations of the mean?

To estimate probabilities,set up a fraction with the number of in the numerator and the number of in the denominator