The two-sample t-test is applied to compare whether the average
difference between two groups is significant or if it is due
instead to random chance.
Use good references,
1. Briefly, describe the difference between
Unpaired Two-Sample T-test and
Paired Two-Sample T-test.
2. Provide an application example for Unpaired
Two-Sample T-test, and stablish the Ho and Ha Hypotheses.
3. Provide an application example for Paired
Two-Sample T-test, and stablish the Ho and Ha Hypotheses.
4. Explain the purpose of P-values and...
Conduct a t-test for differences in weights between two groups
of monkeys. Have group 1 as y and group 2 as x. What is the null
hypothesis with evidence.
Give lower and upper values for the 95% confidence interval for
the difference in means given by the t-test output. Are values
similar to the output from an AVOVA or MCP test output ? If so,
which values.
The values are
Group 1= 9.7, 9.5, 9.2, 8.5, 10.9, 9.8, 8.7, 9.8,...
We wish to test whether or not there is a difference between two
of our production lines in terms of the defect rate. We examine 400
products on Line A and find that 40% are defective, whereas we
examine 100 products on Line B and find that 20% are defective.
What is the appropriate test statistic here?
data =
X1= 14, 8, 6, 14, 20, 13, 9, 12
x2= 13, 4, 1, 8, 10, 12, 8, 6
1. Find the difference between the two groups when using
a dependent t-test then find the independent
two-sample t-test, and compare the results with those from
the dependent t-test
What is the difference between a team
and a group?
Teams are groups, but what makes them unique? Their unity? Their
focus on group goals? The interdependence among members?
TASKS
(A-E):
A. Think of various teams you, or a family member of yours, have
been a member.
Examples of teams could be any of the following:
workgroup in a business setting
sports team
military squad
medical team are all good examples of the kinds of groups to
investigate.
B. After...
Paired-/Related Samples T-test
Use it to test whether there is a difference between the two
conditions(note: conditions must be RELATED-participants provide in
each condition).
You are interested in the relationship satisfaction of young
adults before and after they go off to college/university, which
separates them from their sweetheart. You asked four couples to
rate the satisfaction of their relationship (on a scale of 0-50)
before leaving for school and then again after a semester. Here are
the data:
Pair Before...
write an essay explaining whether you think differences between
in-groups and out-groups are a problem and (if so) why they are a
problem, and for whom they are a problem. Second, imagine that you
were just hired as a manager of a new group, and that you would
have ten employees reporting to you. Include in your essay an
explanation of what you would do about differences between
in-groups and out-groups.
Complete the following table and test whether there is a
difference among the group means at a 0.025 level of
significance.
Source
df
SS
MS
F
Among Groups
787.5
3.5
Within Groups
16
1200
Total
Two groups of students are selected to test different learning
techniques. The test scores of group 1 were: 95, 73, 68, 95, 98,
79, 98, 86, 76, 89, 89, 94. The test scores of group 2 were: 100,
80, 95, 90, 95, 98, 100, 100. Can it be said with 95% confidence
that one group outperformed the other?
In a study designed to test whether there is a
difference between the
average heights of adult females born in two different counties,
country
A and country B, random samples yielded the following
results:
Yielded Values Country A Country B
sample size 120 150
sample mean 62.7 61.8
sample variance 2.50 2.62
Test the hypothesis, at 5% level, the null hypothesis that the
corresponding population means are equal against the alternative
that they
are not equal.