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?

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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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Transcribed Image Text: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 & # $ % 8 6. 3 4 y e r d b n. m C V この
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
Transcribed Image Text: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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