Question

A developmental psychologist believes that word chunking impacts vocabulary development. To investigate, the psychologist assesses a group of 6-year olds by asking them to recall as many words as they can starting with the letter "v". The psychologist then asks the parents to ensure their children practice word chunking for 60 minutes each day for four weeks. At the end of the four weeks, the psychologist assesses the same children by asking them to recall as many words starting with the letter "v" again. What can be concluded with α = 0.10? The word recall data are below.

1nd	2nd
6 8 9 5 9 6 4 7	5 8 6 2 8 3 3 5

c) Obtain/compute the appropriate values to make a decision about H₀.
(Hint: Make sure to write down the null and alternative hypotheses to help solve the problem.)
critical value =  ; test statistic =
Decision:  ---Select--- Reject H0 Fail to reject H0

d) If appropriate, compute the CI. If not appropriate, input "na" for both spaces below.
[  ,  ]

e) Compute the corresponding effect size(s) and indicate magnitude(s).
If not appropriate, input and/or select "na" below.
d = ______ ;   ---Select--- na trivial effect small effect medium effect large effect
r² = ______ ;   ---Select--- na trivial effect small effect medium effect large effect

f) Make an interpretation based on the results.

Word chunking significantly impairs vocabulary development.

Word chunking significantly improves vocabulary development.

   Word chunking did not have a significant impact on vocabulary development.

Answer 1

C.

D.

E.

> 0.8 i.e. large effect.

r² = 0.7387 i.e. medium effect

F.

Word chunking significantly impairs vocabulary development.

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