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t test
Independent t test
Dependent t test
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100

What does a paired t test do?

A paired t test compares the means of two related groups to detect whether there are any statistically significant differences between the means.

100

What are the other names for a paired t test?

dependent t test or paired samples t test

100
m1=30 s1=2.1 n1=14 m2=25 s2=1.9 n2=15 What is the value of the standard error of the difference between means?
.742
100

What is the formula for t in a paired t test?

t=(m1-m2)/SmD

100
In a dependent t test what does mD stand for?
the average differences
200
What is an Independent t test?
An independent t test is an inferential statistical test that determines whether there is a statistically significant difference between the means in two unrelated groups.
200
Is a study in which treatments are given in order for effects to be observed called a survey or an experiment?
Experiment
200
m1= 30 m2=25 sdm=.742 What is the observed value of t?
6.739
200
What does SmD stand for
the standard error of mean differences
200

What are the steps to solve a t test? (Note: there are about 7)

1. Define null and alternative hypothesis 2. state alpha 3. Calculate degrees of freedom 4. state the critical value 5. calculate test statistic 6. state results 7. state conclusion

300
Is there a greater chance of sampling error in a small or a large sample
Small samples have a greater chance of error.
300
Two sample means can be obtained only from experiments. True or False
false
300
If n=30 for group 1 and n=32 for another group, what is the value of df for a t test on independent data.
60
300

Does a paired t test use between groups or within group data?

within group data

300
with a sample of 400 people what is the critical value of a two tailed test?
1.96
400
What are sampling errors?
error in a statistical analysis arising from the unrepresentative sample taken.
400

Is there usually more sampling error in independent or paired t tests?

Independent

400
What is another name for an independent t test
two sample t test or student t test
400

what is the formula for finding the degrees of freedom in a paired t test

n-1

400
With a sample of 147 people what is the critical value of a one tailed t test?
1.645
500
What does a small variance among subject mean for sampling errors?
The smaller the variance among the subjects, the less likely that the differences between two means was created by sampling error.
500

Why do paired t tests usually have less sampling error?

They use the same subjects twice rather than two separate samples.

500
Your critical value is 2.110 and your observed value is -2.3, do you accept or reject the null hypothesis?
reject the null hypothesis
500
What is the most common alpha level researchers use?
.05
500

Researchers give IQ tests to a group of people in 2006 and then again in 2014. What type of t test would they your to compare the means.

Paired t test