Concept explainers
To obtain: The probability of selecting a wrong answer if the answer is a random guess.
Answer to Problem 1CQQ
The probability of selecting a wrong answer if the answer is a random guess is 0.8.
Explanation of Solution
Given info:
From the given information, ‘Standard tests’ uses multiple choice questions as it can be graded using a software. In a multiple-choice question, possible correct answers are ‘a, b, c, d, e’ .
Calculation:
Let
The formula for probability of event A is,
Substitute 1 for ‘Number of ways of event A occurs’ and 5 for ‘Number of simple events’
The formula for probability of complement of event A is,
Substitute 0.2 for
Thus, the probability of selecting a wrong answer, if the answer is a random guess is 0.8.
Interpretation:
There is a 0.8 probability of selecting a wrong answer if the answer is a random guess.
Want to see more full solutions like this?
Chapter 4 Solutions
Elementary Statistics Using Excel (6th Edition)
- MATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons IncProbability and Statistics for Engineering and th...StatisticsISBN:9781305251809Author:Jay L. DevorePublisher:Cengage LearningStatistics for The Behavioral Sciences (MindTap C...StatisticsISBN:9781305504912Author:Frederick J Gravetter, Larry B. WallnauPublisher:Cengage Learning
- Elementary Statistics: Picturing the World (7th E...StatisticsISBN:9780134683416Author:Ron Larson, Betsy FarberPublisher:PEARSONThe Basic Practice of StatisticsStatisticsISBN:9781319042578Author:David S. Moore, William I. Notz, Michael A. FlignerPublisher:W. H. FreemanIntroduction to the Practice of StatisticsStatisticsISBN:9781319013387Author:David S. Moore, George P. McCabe, Bruce A. CraigPublisher:W. H. Freeman