# Probability of Events: Sum Rule

Not what you're looking for?

Our psychology department received a new statistics text for review. Prof. Smart in his review provided an interesting table of corrections.

Type: Alterations: 20%, Spelling 50%, Spelling and alterations: 10%.

Assuming that spelling and alterations are the only possible types of corrections, calculate the probability of spotting a correction due to an alteration error or a spelling error and the probability of detecting no correction.

##### Purchase this Solution

##### Solution Summary

In over 300 words, this solution illustrates how to solve these problems based on probability. The solution employs the addition rule of probability when events are not mutually exclusive.

##### Solution Preview

Alterations = Only alterations + Spelling and alterations

20%=Only alteration+10%

or Only alteration= 20% - 10%=10%

Spelling = Only spelling + Spelling and alterations

Or Only spelling = Spelling - Spelling and alterations

=50%-10%=40%

Total correction = Only alterations + Only spelling+ Spelling and ...

##### Purchase this Solution

##### Free BrainMass Quizzes

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

##### Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

##### Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.