Question 1

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 2

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 3

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.

Question 4

A common real world application of the normal curve is________.

Accepted Answer

A)  measuring income levels. 
B)  assigning exam grades. 
C)  setting government budgets. 
D)  None of the answer choices. 
A)  measuring income levels. 
B)  assigning exam grades. 
C)  setting government budgets. 
D)  None of the answer choices.

Question 5

A sample of university students has an average GPA of 2.78 with a standard deviation of 0.45. If GPA is normally distributed, what percentage of the students has GPAs Z score Area. 
a. less than 2.30 
b. less than 2.00 
c. more than 2.00 
d. more than 3.00 
e. between 2.50 and 3.50 
f. between 2.00 and 2.50

Accepted Answer

To answer these questions, we need to c

Question 6

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 7

As used in the social sciences, probabilities are a type of ___________ which can 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 8

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.

Question 9

In terms of construction, the normal curve is what kind of chart?

Accepted Answer

A)  pie chart 
B)  line chart 
C)  histogram 
D)  bar chart 
A)  pie chart 
B)  line chart 
C)  histogram 
D)  bar chart

Question 10

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

Question 11

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 12

If a case has a Z score of 2.3, the standard deviation would be________.

Accepted Answer

A)  4.6 
B)  1 
C)  0 
D)  One cannot calculate it based on this information. 
A)  4.6 
B)  1 
C)  0 
D)  One cannot calculate it based on this information.

Question 13

To obtain the area below a positive Z score or above a negative Z score you would________.

Accepted Answer

A)  subtract the value of the Z score from the mean. 
B)  subtract the area in the "Area Beyond Z" column of the Z score table from 50%. 
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 50%. 
A)  subtract the value of the Z score from the mean. 
B)  subtract the area in the "Area Beyond Z" column of the Z score table from 50%. 
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 50%.

Question 14

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 15

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)  never touch the horizontal axis. 
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)  never touch the horizontal axis. 
D)  maintain the same distance above the horizontal axis beyond the 3rd standard deviation.

Question 16

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 is impossible to estimate. 
A)  At least 500 
B)  About 3 
C)  327 
D)  It is impossible to estimate.

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%

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

By definition, the normal curve is________.

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

A common real world application of the normal curve is________.

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

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

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

In terms of construction, the normal curve is what kind of chart?

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?

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________.

If a case has a Z score of 2.3, the standard deviation would be________.

To obtain the area below a positive Z score or above a negative Z score you would________.

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?

The tails of the theoretical normal curve________.

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

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?

Introduction

Basic Descriptive Statistics Tables Percentages Rates and Ratios and Graphs

Measures of Central Tendency

Measures of Variation

Introduction to Inferential Statistics Sampling and the Sampling Distribution

Estimation Procedures

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

Elaborating Bivariate Tables

Partial Correlation and Multiple Regression and Correlation

Filters

Exam 5: The Normal Curve

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

By definition, the normal curve is________.

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

A common real world application of the normal curve is________.

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

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

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

In terms of construction, the normal curve is what kind of chart?

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?

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________.

If a case has a Z score of 2.3, the standard deviation would be________.

To obtain the area below a positive Z score or above a negative Z score you would________.

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?

The tails of the theoretical normal curve________.

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

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?

Introduction

Basic Descriptive Statistics Tables Percentages Rates and Ratios and Graphs

Measures of Central Tendency

Measures of Variation

Introduction to Inferential Statistics Sampling and the Sampling Distribution

Estimation Procedures

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

Elaborating Bivariate Tables

Partial Correlation and Multiple Regression and Correlation

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 can vary from ___.