Concept explainers
(a)
To find: themean circumference of the control group.
(a)
Answer to Problem 4E
The mean circumference of the control group is 34.9.
Explanation of Solution
Given:
Circumference (inches) | ||||
Control group | 34.6 | 35.4 | 33 | 34.6 |
Treatment group | 31.4 | 33 | 32.4 | 32.6 |
Circumference (inches) | ||||
Control group | 35.2 | 35.2 | 36.2 | 35 |
Treatment group | 33.4 | 33.4 | 34.8 | 33 |
Calculation:
The mean
Here,
And n represents, how many numbers are there in the sample.
The mean circumference of the control group is given by
Conclusion:
Therefore, the mean circumference of the control group is 34.9.
(b)
To find: the mean circumferenceof the treatment group.
(b)
Answer to Problem 4E
The mean circumference of the treatment group is 33.
Explanation of Solution
Calculation:
The mean circumference of the treatment group is given by
Conclusion:
Therefore, the mean circumference of the treatment group is 33.
(c)
To find: the experimental difference of the means.
(c)
Answer to Problem 4E
The experimental difference of the mean is -1.9.
Explanation of Solution
Calculation:
Experimental difference of the mean is the difference of the mean of treatment group and the mean of the control group.
Thus,
Conclusion:
Therefore, the experimental difference of the mean is -1.9.
(d)
To display: the data in a double dot plot.
(d)
Answer to Problem 4E
Explanation of Solution
Calculation:
Double dot plot for the given data is
Conclusion:
Therefore, the Double dot plot is displayed.
(e)
To explain: the conclusion.
(e)
Answer to Problem 4E
It is concluded that the low-level laser therapy may be slightly effective in reducing the waist circumference of adults.
Explanation of Solution
Calculation:
The plot of the data shows that the two data sets tend to be fairly symmetric and have outliers.
Thus, It is concludedthat the low-level laser therapy may be slightly effective in reducing the waist circumference of adults.
Conclusion:
Therefore, It is concludedthat the low-level laser therapy may be slightly effective in reducing the waist circumference of adults.
Chapter 11 Solutions
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