(a)
To make a dot plot of the difference (Weight minus Groove) in the estimate of wear for each tire using the two methods.
(a)
Explanation of Solution
The dot plot is as follows:
(b)
To describe what the graph reveals about whether the two methods give similar estimates of tier wear on average.
(b)
Explanation of Solution
From the above graph in part (a), we have,
We note that
(c)
To calculate the mean difference and the standard deviation of the differences and interpret the mean difference.
(c)
Answer to Problem 75E
The mean is
Explanation of Solution
It is given that:
The mean is:
The sample variance is then as:
The sample standard deviation is then,
The difference is
Chapter 10 Solutions
PRACTICE OF STATISTICS F/AP EXAM
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