(a)
To write appropriate hypotheses.
(a)
Answer to Problem 30E
Explanation of Solution
In the question, a company with large fleet of cars hoped to keep gasoline costs down and sets a goal of attaining a fleet average of at least
In which, the
(b)
To explain do think the necessary assumption for inference are satisfied.
(b)
Answer to Problem 30E
The necessary assumption for inference are satisfied.
Explanation of Solution
In the question, a company with large fleet of cars hoped to keep gasoline costs down and sets a goal of attaining a fleet average of at least
Now, we will check if the necessary assumption for inference are satisfied or not, as:
First is random condition: It is satisfied because the sample is given to be a random sample. The second is the independent condition: It is satisfied since the sample of
And the third is the normal condition: It is satisfied since the sample size
(c)
To describe the approximate sampling distribution model for the mean fuel economy in such samples.
(c)
Explanation of Solution
In the question, a company with large fleet of cars hoped to keep gasoline costs down and sets a goal of attaining a fleet average of at least
Since the sample of size
The degrees of freedom is the sample size decreased by one as:
And the test statistic is as:
Thus we know that
(d)
To find out what is the P-value for this result.
(d)
Answer to Problem 30E
Explanation of Solution
In the question, a company with large fleet of cars hoped to keep gasoline costs down and sets a goal of attaining a fleet average of at least
And the test statistic is as:
The P-value is the number in the column title of table T in appendix F containing the t -value in the row is:
(e)
To explain what this P-value means.
(e)
Explanation of Solution
In the question, a company with large fleet of cars hoped to keep gasoline costs down and sets a goal of attaining a fleet average of at least
And the P-value is
(f)
To explain what is your conclusion.
(f)
Explanation of Solution
In the question, a company with large fleet of cars hoped to keep gasoline costs down and sets a goal of attaining a fleet average of at least
And the P-value is
Thus, we conclude that there is no sufficient evidence to support the claim that they have failed to attain their fuel economy goal.
Chapter 23 Solutions
Stats: Modeling the World Nasta Edition Grades 9-12
Additional Math Textbook Solutions
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