(a)
To explain to a researcher why this is a bad idea and suggest a better method of deciding when each subject receives the two treatments.
(a)

Explanation of Solution
This idea is a bad idea because by making the subject test with no coffee one day and the other subject with coffee on the next day does not allow us to see if the variable of coffee improves the scores because of the outside factor. For example, if the students may have slept better before Monday’s exam test than Wednesday’s test because of the weekend. The better method of deciding is the hypothesis testing that can give appropriate results.
(b)
To carry out an appropriate test to find whether there is convincing evidence that drinking coffee improves memory, on average.
(b)

Answer to Problem T10.13SPT
We are
Explanation of Solution
To perform a test statistics, define the hypothesis:
Where
Since the confidence interval is not stated then we will use
Now, we have,
And the degree of freedom will be:
Thus, the test statistic value will be:
Thus the
We conclude that the
Chapter 10 Solutions
PRACTICE OF STATISTICS F/AP EXAM
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