A child psychologist predicts 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 "s". The psychologist then asks the parents to ensure their children practice word chunking for 40 minutes each day for three weeks. At the end of the three weeks, the psychologist assesses the same children by asking them to recall as many words starting with the letter "s" again. What can be concluded with α = 0.01? The word recall data are below.

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

a) What is the appropriate test statistic?
---Select--- na OR z-test OR One-Sample t-test OR Independent-Samples t-test OR Related-Samples t-test

b)
Condition 1:
---Select--- words starting with "s" OR 1nd assessment OR 2nd assessment OR three weeks OR 40 minutes
Condition 2:
---Select---words starting with "s" OR 1nd assessment OR 2nd assessment OR three weeks OR 40 minutes

c) Obtain/compute the appropriate values to make a decision about H₀.
critical value = _____ ; test statistic = _____
Decision: ---Select--- Reject H0 OR 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 OR trivial effect OR small effect OR medium effect OR large effect
r² = _____ ; ---Select--- na OR trivial effect OR small effect OR medium effect OR large effect

f) Make an interpretation based on the results.

A) Word chunking significantly impairs vocabulary development.

B) Word chunking significantly improves vocabulary development.

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