Question

49. Which analysis should the experimenter conduct to test the hypothesis?

Z test |
||

Repeated Measures T test |
||

Single Sample T test |
||

Independent samples T test |

Answer #1

Depends on what type of experiment the researcher is doing.

- Z-test: It is used when we know the population variance and can be used for testing hypothesis against one population parameter or testing the difference between the two population
- Repeated Measures t-test or Related Samples t-test: It is used when we compare the mean difference between two data sets. The same subject is measured twice, once in one condition and 2nd in different conditions. Samples are related
- Single Sample t-test: It is used when we want to find whether the population parameter such as the mean is different from a hypothesized value. It is used when we don't know the population variance or the sample size is very less
- Independent Samples t-test: It is used when we compare the mean difference between two data sets. In this case, the subjects are different in both cases. Samples are independent

Describe how the outcome of a hypothesis test and measures of
effect size using the repeated-measures t statistic are
influenced by sample size and sample variance.

For each of the following studies determine which t-test is the
appropriate analysis (one sample, repeated measures, independent
samples).
A researcher is examining whether a cognitive behavioral
therapy has an effect on levels of anxiety. She records the level
of anxiety in a group of patients prior to therapy, and again after
the 8-week therapy.
A professor is interested in seeing whether or not his class is
more neurotic than an estimated population mean. He records his
class’s neuroticism score...

Identify the appropriate statistical test for each research
description:
Single-sample z-test
Single-samplet-test
Independent samples t-test
Related samples t-test (repeated measures or matched
samples)
Correlation
A researcher would like to determine whether an over-the-counter
cold medication has an effect on mental alertness. A sample of n =
16 participants is obtained, and each person is given a standard
dose of the medication one hour before being tested in a driving
simulation task. For the general population, scores on the
simulation task...

If the outcome of a repeated-measures t test is reported as
t(23) = 2.76, what is the correct conclusion for an experiment that
tested the effect of meditation on memory?
A. The data showed a significant effect meditation on memory
with p < .05 but no significant effect with p < .01, 2-tails
test.
B. The data showed a significant effect of meditation on memory
with p < .05 and p < .01, 2-tails test.
C. The data showed a...

A repeated-measures design deals with the differences of the
means, while an independent-measures design deals with the mean of
the differences."
True False
A repeated-measures design study comparing two samples uses
_____ groups of participants and obtains ____ score(s) for each
participant.
"1, 1"
"1, 2"
"2, 1"
"2, 2"
A repeated-measures design is better than an
independent-measures design because it requires more subjects.
True False
A repeated-measures t-test is also called a within-subjects,
paired, or dependent t-test. "
True...

Which of the following is not an assumption underlying the
independent-measures t formula for hypothesis testing?
The observations within each sample must be independent.
The two populations from which the samples are selected must be
normal.
The two samples must have equal sample sizes.
The two populations from which the samples are selected must
have equal variances.

Consider the following data from a repeated-measures design. You
want to use a repeated-measures t test to test the null hypothesis
H0: µD = 0 (the null hypothesis states that
the mean difference for the general population is zero). The data
consist of five observations, each with two measurements, A and B,
taken before and after a treatment. Assume the population of the
differences in these measurements are normally distributed.
Observation
A
B
1
1
3
2
3
4
3...

Conduct a paired-samples (repeated measures) t test using the
following data:
The Dark Souls video game series has achieved meme-status as
being controller-breaking difficult. A researcher was interested in
how frustrating playing the games can be so she asked participants
to rate their base frustration levels and then had them play the
first game in the series – Dark Souls – as its seen as one of the
harder games. The data is as follows:
Participant
Before
After
A
6...

Which of the following are assumptions for the
independent-measures t formula for hypothesis testing?
1) The observations within each sample must be independent
2) The two populations from which the samples are selected must
be normal
3) The two populations from which the samples are selected must
be have equal variances
4) All of the above

discuss the differences between a one-sample z-test, one-sample
t-test, the independent samples t-test and the dependent samples
t-test. Specifically, under what circumstances would you conduct
each test and what type of information comes from a known/defined
population versus your sample data?

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