Question

A researcher was interested in learning about the effect of caffeine consumption on problem solving. To examine this relationship, participants were randomly selected and assigned to one of four conditions: no caffeine consumption, 100 mg dosage of caffeine, 200 mg dosage of caffeine, or 300 mg dosage of caffeine. The participants were then asked to solve as many anagrams* as possible in a 5 minute period. The results of the study are presented below.

*Anagrams are word puzzles that are solved by rearranging the letters so that each letter is used exactly once to create a new word, for example: No Eagle in Jail = Angelina Jolie or Balk Tables = Basketball.

No Caffeine Group

3

7

4

4

3

8

8

4

4

7

1

5

3

8

5

6

100 mg Group

6

8

9

8

11

10

7

5

5

8

8

5

7

7

9

7

200 mg Group

3

11

6

6

5

8

6

6

8

8

6

9

7

8

9

6

300 mg Group

6

5

7

6

7

5

9

4

10

8

7

7

9

5

3

6

What is the SS Total for this set of data?

Answer 1

Sol:

Perform one way ANOVA

Install analysis toolpak and then go to

Data>Data analysis>ANOVA single factor we get

From Output:

SS total=278