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December 21, 2014

December 21, 2014

Posted by **Anonymous** on Thursday, November 15, 2012 at 7:59pm.

Since we are comparing more than 2 groups, we will use ANOVA to test whether the data provide evidence that SAT score is related to study strategy.

Question 4

Select one answer.

10 pointsIf we let ì1, ì2, and ì3 be the mean SAT scores for students who use learning strategies 1, 2, and 3, respectively, the appropriate hypotheses in this case are:

(a)

(b)

(c)

(d)

(e) Both (a) and (c) are correct.

(f) Both (b) and (d) are correct.

Question 5

Select one answer.

10 pointsOne of the conditions that allows us to use ANOVA safely is that of equal (population) standard deviations. Can we assume that this condition is met in this case?

(a) No, since the three sample standard deviations are not all equal.

(b) No, since the population standard deviations are not given, so we cannot check this condition.

(c) Yes, since 5.7 - 4.9 < 2.

(d) Yes, since 5.7 / 4.9 < 2.

Question 6

Select one answer.

10 pointsUsing the following output:

we can conclude that:

(a) the data provide strong evidence that SAT scores are related to learning strategy.

(b) the data provide strong evidence that SAT scores are related to learning strategy in the following way: The mean SAT score for students who pay for coaching is higher than the mean SAT score for students who study themselves, which in turn is higher than that of students who do not study for the test.

(c) the data provide strong evidence that the three mean SAT scores (representing the three learning strategies) are not all equal.

(d) the data do not provide sufficient evidence that SAT scores are related to learning strategy.

(e) Both (a) and (c) are correct.

SaveSubmit and Finish

- STAT (incomplete) -
**PsyDAG**, Saturday, November 17, 2012 at 1:01pmData is missing.

Also, we do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.

- STAT -
**Anonymous**, Monday, November 25, 2013 at 7:01pmab

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