he scores on a (hypothetical) vocabulary test of a group of 20 year old’s and a group of 60 year old’s are shown below.   20 yr olds 60 yr olds 27 26 26 29 21 29 24 29 15 27 18 16 17 20 12 27 13     a) Test the mean difference for significance using the .05 leve). b) List the assumptions made in computing your answer.

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The scores on a (hypothetical) vocabulary test of a group of 20 year old’s and a group of 60 year old’s are shown below.

 

20 yr olds

60 yr olds

27

26

26

29

21

29

24

29

15

27

18

16

17

20

12

27

13

 

 

a) Test the mean difference for significance using the .05 leve).

b) List the assumptions made in computing your answer.

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