Concept explainers
(a)
To explain: the reason for the random assignment of subjects by researchers to the two treatment classes.
(a)
Explanation of Solution
Subjects are assigned arbitrary to the two treatments in order to ensure that the two treatment groups are as identical as possible and to minimise the influence of any unmeasured variables.
(b)
To explain: the inference with suitable evidence will draw and justify the answer.
(b)
Answer to Problem 57E
The average is greater for students with internal reasons than for students with external reasons.
Explanation of Solution
Given:
It is noticed on the dot plot that almost no dots lay above 4.15 and to the right of it. This suggests that the sample mean difference of 4.15 is unusual and therefore we infer that, and those with internal reasons, the mean tends to be significantly greater than and those with external reasons.
(c)
To Explain: the error that make type I error or type II error on the basis of given information.
(c)
Answer to Problem 57E
Type I error
Explanation of Solution
The hypothesis testing
It is concluded in part (b) that the means were significantly different and therefore dismissed the null hypothesis.
Type I error: Reject
Type II error: Fail to reject
Although, it is rejected null hypothesis
Chapter 10 Solutions
The Practice of Statistics for AP - 4th Edition
Additional Math Textbook Solutions
Fundamentals of Statistics (5th Edition)
Introductory Statistics
Elementary Statistics: Picturing the World (7th Edition)
Statistics: The Art and Science of Learning from Data (4th Edition)
Introductory Statistics
Introductory Statistics (10th Edition)
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