Answered: A school psychologist is interested in…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A school psychologist is interested in determining if children with attention deficit hyperactivity disorder (ADHD) learn better if English literature is read to them rather than having them read the material alone by themselves. A random sample of 10 sixth graders with ADHD is selected and divided into two groups of n=9. One of the groups has a story read to them (Listening Group) and the other reads the story alone by themselves (Reading Group). A test on the story is given after each group has finished reading or hearing the story. The following scores were obtained with 20 being a perfect score. What is the t-statistic?

t-Test: Two-Sample Assuming Equal Variances
G1
G2
Mean
8.777777778
11.44444444
Variance
3.944444444
3.277777778
Observations
9
9
Pooled Variance
3.611111111
Hypothesized Mean
df
16
t Stat
-2.97683363
P(T<=t) one-tail
t Critical one-tail
0.004449553
1.745883676
P(T<=t) two-tail
t Critical two-tail
0.008899105
2.119905299
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Two-sample t-test, independent groups
Reading Group
Listening Group
10
15
10
12
13
12
11
8
10
8.
6.
10
11
6.
10
11
11
Count(n)
Mean
(SS)
STDEV.S
df
DEV
S(M1-M2)
alpha
tcrit
Reject Ho
Fail to reject Ho
Decision
tobs
Cohen's d

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