Given the mean of the difference scores is 7.0,
the standard deviation of the difference scores is 2.8, and there were
25 in the sample, solve for the following problems, showing all
work to receive full credit:
6) Solve for the standard
error of the difference scores:
Work:
Answer:
7) Calculate the
correlated-groups t-test to determine the
tobt.
Work:
Answer:
8) If this is a
non-directional test, what is the t
cv?
(No work needed)
Answer:
Identify the statistical test that should be
used to analyze the data for the following
study:
9) Does a GRE prep course
improve GRE scores? GRE practice test scores were compared before
and after 40 students had taken a very expensive GRE prep
course.
Answer:
Given a result of
t
(60) = 1.75 for a one-tailed paired
samples
t-test,
answer the following:
10) What is the sample
size?
Answer:
11) What is the
tcv?
Answer:
12) What is the
tobt?
Answer:
13) What should the researcher conclude (reject
or fail to reject the null hypothesis)?
Answer: