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STAT 200

Homework #6

Question 1) One group of 30 normally developing toddlers earned a mean score of 40 for aggression on the CBCL (SD = 7).A group of 20 aggressive toddlers earned a mean score of 45 for this measure (SD = 5). Is the difference between these two groups statistically significant?

Question 2) Please explain the purpose of the related samples t-test.

Question 3) Please explain how the use of the related samples t-test eliminates a source of error from calculations of a tvalue.

Question 4) Please solve this problem:

A sample of six students receives a reading literacy program at the beginning and end of third grade. Is there a significant improvement in their scores over the year?

Participant	Posttest	Pretest	Difference	Squared Difference
1	40	25
2	35	23
3	37	21
4	41	27
5	44	29
6	43	30
			Sum = Mean =	Sum =