
Concept explainers
To find: the question which is different

Answer to Problem 2E
The different question is
“What is the square root of the average of the squared differences from
Explanation of Solution
Given:
Weight of tumor (grams) | ||||||
Control group | 3.3 | 3.2 | 3.7 | 3.5 | 3.3 | 3.4 |
Treatment group | 0.4 | 0.6 | 0.5 | 0.6 | 0.7 | 0.5 |
Calculation:
Experimental difference of the mean is the difference of the mean of treatment group and the mean of the control group.
Thus, 1st 2nd and 4th questions are actually same.
Thus,
Now,
The mean
Here,
And n represents, how many numbers are there in the sample
So,
Thus,
The 3rd question is a different question.
The average of the squared differences from the mean that is -2.85 is called the variance.
And the square root of the variance is the standard deviation.
The square root of the average of the squared differences from -2.85 is about 5.03.
Conclusion:
Therefore,the 3rd question is a different question.
Chapter 11 Solutions
Big Ideas Math A Bridge To Success Algebra 2: Student Edition 2015
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