Question 1

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 the above 
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 the above D

Question 2

As the standard deviation of a normal distribution increases, the percentage of the area between ± 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 B

Question 3

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 B

Question 4

The probability of getting a 1 in a single toss of a six sided die would be

Accepted Answer

A)  2 to 1 
B)  60 to 1 
C)  1 in 6 
D)  impossible to estimate with the information given 
A)  2 to 1 
B)  60 to 1 
C)  1 in 6 
D)  impossible to estimate with the information given

Question 5

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 6

The mean on a standardized test is 100 and the standard deviation is 35. Your score is 65. What percentage of the scores were higher than yours?

Accepted Answer

A)  about 84% 
B)  no more than 50% 
C)  about 34% 
D)  about 16% 
A)  about 84% 
B)  no more than 50% 
C)  about 34% 
D)  about 16%

Question 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 8

Distributions of IQ scores are normally distributed because

Accepted Answer

A)  the underlying quality being tested - intelligence - is normally distributed 
B)  IQ tests are designed to produce in normal distributions 
C)  there is no cultural bias in the tests 
D)  they reflect the natural distribution of intelligence: human beings are genetically programmed to have an average intelligence of about 100. 
A)  the underlying quality being tested - intelligence - is normally distributed 
B)  IQ tests are designed to produce in normal distributions 
C)  there is no cultural bias in the tests 
D)  they reflect the natural distribution of intelligence: human beings are genetically programmed to have an average intelligence of about 100.

Question 9

The area between a negative Z score and a positive Z score can be found by

Accepted Answer

A)  subtracting the Z scores from each other 
B)  subtracting each Z score from the mean and adding the results 
C)  adding the Z scores and finding the area in the Z score table for the summed Z scores 
D)  adding the areas between each Z score and the mean 
A)  subtracting the Z scores from each other 
B)  subtracting each Z score from the mean and adding the results 
C)  adding the Z scores and finding the area in the Z score table for the summed Z scores 
D)  adding the areas between each Z score and the mean

Question 10

For 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 11

The tails of the theoretical normal curve

Accepted Answer

A)  intersect with the horizontal axis between the 4th and 5th standard deviation 
B)  intersect with the horizontal axis beyond the 5th standard deviation 
C)  extend infinitely in both directions 
D)  maintain the same distance above the horizontal axis beyond the 3rd standard deviation 
A)  intersect with the horizontal axis between the 4th and 5th standard deviation 
B)  intersect with the horizontal axis beyond the 5th standard deviation 
C)  extend infinitely in both directions 
D)  maintain the same distance above the horizontal axis beyond the 3rd standard deviation

Question 12

As used in the social sciences, probabilities are a type of ___________ which vary from _____________ .

Accepted Answer

A)  percentage, 0 to 1 
B)  fraction, 0 to 100 
C)  proportion, 0.00 to 1.00 
D)  Z score, 0 to infinity 
A)  percentage, 0 to 1 
B)  fraction, 0 to 100 
C)  proportion, 0.00 to 1.00 
D)  Z score, 0 to infinity

Question 13

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 14

The area between two negative Z scores can be found by

Accepted Answer

A)  adding the Z scores and finding the area below the total Z score 
B)  subtracting the Z scores and finding the total area above the total Z score 
C)  finding the area between each Z score and the mean and subtracting the smaller area from the larger 
D)  finding the area between each Z score and the mean and adding the areas 
A)  adding the Z scores and finding the area below the total Z score 
B)  subtracting the Z scores and finding the total area above the total Z score 
C)  finding the area between each Z score and the mean and subtracting the smaller area from the larger 
D)  finding the area between each Z score and the mean and adding the areas

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 the above 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 the above are possible

Question 16

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 17

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 18

The Z score table gives the area between a score and the mean. For a Z score of -1.00 that area (in percentages) is

Accepted Answer

A)  34.13% 
B)  -34.13% 
C)  68.26% 
D)  -68.26% 
A)  34.13% 
B)  -34.13% 
C)  68.26% 
D)  -68.26%

Question 19

Unlike empirical distribution, the theoretical normal curve is

Accepted Answer

A)  positively skewed 
B)  negatively skewed 
C)  bimodal 
D)  perfectly symmetrical 
A)  positively skewed 
B)  negatively skewed 
C)  bimodal 
D)  perfectly symmetrical

Question 20

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 8?

Accepted Answer

A)  0.34 
B)  0.68 
C)  0.84 
D)  0.01 
A)  0.34 
B)  0.68 
C)  0.84 
D)  0.01

When an empirical normal distribution of scores is standardized

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

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

The probability of getting a 1 in a single toss of a six sided die would be

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

The mean on a standardized test is 100 and the standard deviation is 35. Your score is 65. What percentage of the scores were higher than yours?

What is the probability that a randomly selected case from the sample in the previous question would have a score of 52 or more?

Distributions of IQ scores are normally distributed because

The area between a negative Z score and a positive Z score can be found by

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

The tails of the theoretical normal curve

As used in the social sciences, probabilities are a type of _ which vary from ___ .

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

The area between two negative Z scores can be found by

A Z score of +1.00 indicates a score that lies

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?

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?

The Z score table gives the area between a score and the mean. For a Z score of -1.00 that area (in percentages) is

Unlike empirical distribution, the theoretical normal curve is

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 8?

Introduction

Basic Descriptive Statistics Percentages, Ratios Rates, Tables, Charts Graphs

Measures of Central Tendency

Measures of Dispersion

Introduction to Inferential Statistics Sampling the Sampling Distribution

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

Bivariate Association for Nominal- and Ordinal-Level Variables

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and

Filters

Exam 5: The Normal Curve

When an empirical normal distribution of scores is standardized

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

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

The probability of getting a 1 in a single toss of a six sided die would be

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

The mean on a standardized test is 100 and the standard deviation is 35. Your score is 65. What percentage of the scores were higher than yours?

What is the probability that a randomly selected case from the sample in the previous question would have a score of 52 or more?

Distributions of IQ scores are normally distributed because

The area between a negative Z score and a positive Z score can be found by

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

The tails of the theoretical normal curve

As used in the social sciences, probabilities are a type of ___________ which vary from _____________ .

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

The area between two negative Z scores can be found by

A Z score of +1.00 indicates a score that lies

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?

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?

The Z score table gives the area between a score and the mean. For a Z score of -1.00 that area (in percentages) is

Unlike empirical distribution, the theoretical normal curve is

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 8?

Introduction

Basic Descriptive Statistics Percentages, Ratios Rates, Tables, Charts Graphs

Measures of Central Tendency

Measures of Dispersion

Introduction to Inferential Statistics Sampling the Sampling Distribution

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

Bivariate Association for Nominal- and Ordinal-Level Variables

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and

Filters

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

As used in the social sciences, probabilities are a type of _ which vary from ___ .