Concept explainers
(a)
To interpret the value of
(a)
Answer to Problem 8E
Explanation of Solution
In the question researchers examined how well does the number of beers a person drinks predict his or her blood alcohol content. Sixteen volunteers with an initial BAC of zero drank randomly assigned number of cans of beer. Least squared regression line was performed on the data. A residual plot and a histogram of the residual are shown in the question. The computer output is given for this data.
This means that the slope of the sample regression line is expected to vary by about
(b)
To find the critical value for a
(b)
Answer to Problem 8E
Explanation of Solution
In the question researchers examined how well does the number of beers a person drinks predict his or her blood alcohol content. Sixteen volunteers with an initial BAC of zero drank randomly assigned number of cans of beer. Least squared regression line was performed on the data. A residual plot and a histogram of the residual are shown in the question. The computer output is given for this data. Thus, it is given,
The degrees of freedom is the
The critical t -value can be found in table B in the row of
Thus, the confidence interval is as:
(c)
To interpret the interval from part (b) in context.
(c)
Explanation of Solution
In the question researchers examined how well does the number of beers a person drinks predict his or her blood alcohol content. Sixteen volunteers with an initial BAC of zero drank randomly assigned number of cans of beer. Least squared regression line was performed on the data. A residual plot and a histogram of the residual are shown in the question. The computer output is given for this data. Thus from part (b) we have,
Thus, we are
(d)
To explain the meaning of “
(d)
Explanation of Solution
In the question researchers examined how well does the number of beers a person drinks predict his or her blood alcohol content. Sixteen volunteers with an initial BAC of zero drank randomly assigned number of cans of beer. Least squared regression line was performed on the data. A residual plot and a histogram of the residual are shown in the question. The computer output is given for this data. The “
Chapter 12 Solutions
The Practice of Statistics for AP - 4th Edition
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