(a)
To explain is there good evidence that one approach is more likely to be effective than the other and state the null and alternative hypotheses, obtain test statistics and P-value and conclude in context.
(a)
Answer to Problem 20.28E
Yes, there is good evidence that one approach is more likely to be effective than the other and hypotheses are:
And,
Explanation of Solution
In the question, it is given that they found that
The proportions are as:
Thus, to do the mechanics of a hypothesis test for equality of population proportions we will use the calculator
As we know that if the P-value is less than or equal to the significance level then the null hypothesis is rejected, so we have,
Thus, we have sufficient evidence to conclude that one approach is more likely to be effective than the other.
(b)
To explain how large is the difference and obtain and interpret in context a
(b)
Answer to Problem 20.28E
We are
Explanation of Solution
In the question, it is given that they found that
And the differences are:
Now, a
Thus, we are
(c)
To explain how effective is that best method and obtain and interpret in context a
(c)
Answer to Problem 20.28E
We are
Explanation of Solution
In the question, it is given that they found that
And the
Thus, we are
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Chapter 20 Solutions
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