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(a)
To create an appropriate display of these data and explain what do you see.
(a)
Explanation of Solution
In the question, the average numbers of runs scored in American league and National league games are recorded. Thus, the appropriate displays of the following are:
For American league games:
For National league:
By looking at the bar chart we can say that both the bar graph are uni-modal and approximately symmetric in nature.
(b)
To estimate the
(b)
Answer to Problem 17E
The mean of runs scored in American league games is
Explanation of Solution
In the question, the average numbers of runs scored in American league and National league games are recorded. Thus, the mean of runs scored in American league games can be calculated as:
The formulas used in excel to find the mean is as follows:
AVERAGE (
| American League games | |
| Average | =AVERAGE(C1:C13) |
And the result will be as:
| American League games | |
| Average | 9.854 |
Thus, the mean of runs scored in American league gamesis
(c)
To explain do you think the
(c)
Answer to Problem 17E
No, it is not unusual.
Explanation of Solution
In the question, the average numbers of runs scored in American league and National league games are recorded. Now, we think that the
(d)
To explain why you should not use two separate confidence interval to decide whether the two leagues differ in average number of runs scored.
(d)
Explanation of Solution
In the question, the average numbers of runs scored in American league and National league games are recorded. Now, we should not use two separate confidence interval to decide whether the two leagues differ in average number of runs scored because we want to work directly with the average difference. The two separate confidence intervals does not answer questions about the difference. The difference has a different standard deviation, found by adding variances.
Chapter 24 Solutions
Stats: Modeling the World Nasta Edition Grades 9-12
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