Essentials Of Statistics
Essentials Of Statistics
4th Edition
ISBN: 9781305093836
Author: HEALEY, Joseph F.
Publisher: Cengage Learning,
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Addition Rule of Probability
It simply refers to the likelihood of an event taking place whenever the occurrence of an event is uncertain. The probability of a single event can be calculated by dividing the number of successful trials of that event by the total number of trials.
Expected Value
When a large number of trials are performed for any random variable ‘X’, the predicted result is most likely the mean of all the outcomes for the random variable and it is known as expected value also known as expectation. The expected value, also known …
Probability Distributions
Understanding probability is necessary to know the probability distributions. In statistics, probability is how the uncertainty of an event is measured. This event can be anything. The most common examples include tossing a coin, rolling a die, or choosi…
Basic Probability
The simple definition of probability it is a chance of the occurrence of an event. It is defined in numerical form and the probability value is between 0 to 1. The probability value 0 indicates that there is no chance of that event occurring and the prob…
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Textbook Question
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Chapter 8, Problem 8.2P

Two sociologists administered questionnaires to samples of undergraduates that measured attitudes toward interpersonal violence (higher scores indicate greater approval of interpersonal violence). Test the results as reported here for gender, racial, and social-class differences.

a.

Sample 1
(Males)		 Sample 2
(Female)
X ¯ 1 = 2.99 X ¯ 2 = 2.29
s 1 = 0.88 s 2 = 0.91
N 1 = 122 N 2 = 251

b.

Sample 1
(Blacks)		 Sample 2
(Whites)
X ¯ 1 = 2.76 X ¯ 2 = 2.49
s 1 = 0.68 s 2 = 0.91
N 1 = 43 N 2 = 304

c.

Sample 1
(White Collar)		 Sample 2
(Blue Collar)
X ¯ 1 = 2.46 X ¯ 2 = 2.67
s 1 = 0.91 s 2 = 0.87
N 1 = 249 N 2 = 97

Summarize your results in terms of the significance and the direction of the differences. Which of these three factors seems to make the biggest difference in attitudes toward interpersonal violence?

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