Question

Explain the differences between a research design that utilizes an independent measures t-test to analyze the data, and a repeated measures t-test to analyze the data.

Answer #1

Ans:

We use independent measures t-test to compare groups of participants that are not related in any way. So,we select the groups,which are independent from one another. So,subjects or individuals in one group have no relationship to participants in the second group. so, sometimes it is called as a between subjects design.

We use repeated measures t test to
compare groups that are related in some way. There are many ways
that participants in two groups can be related. One way is that
participants in the first group are the same as participants in the
second group. This is sometimes called a **repeated measures
design**.In this case,same participants are measured at
different points of time,to check if there difference in means of
both measures.

Describe an imaginary research study where it would be
appropriate to use an independent-measures design that could be
analyzed using a t hypothesis test. What are the two sets of data
to be compared? What are the null & alternative hypotheses?

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...

1. For each study design below, choose whether it is a one
sample T, an independent T, or a repeated measures T.
a. A gym class at a private school takes a fitness test and
their scores are compared with a fitness test of different students
at a public school.
b. Students taking Research One are tested on their research
knowledge at the start of the term and again at the end of the
term.
c. The average income for...

Please state a research scenario that you would analyze with an
Independent-samples t-test. Make sure to state your independent
variable and dependent variable.

An independent t-test is used to test for:
Differences between means of groups containing different
entities when the sampling distribution is normal, the groups have
equal variances and data are at least interval.
Differences between means of groups containing different
entities when the data are not normally distributed or have unequal
variances.
Differences between means of groups containing the same entities
when the data are normally distributed, have equal variances and
data are at least interval.
Differences between means of...

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?

I want to design a psychology research study in spss asseing
the impact of an independent variable (regular exercise over 8
weeks) on a dependent variable (depression). impact on depression
measured as change in scores on the widely accepted BDI-II
depression diagnostics test. Measuring points at start and end of
the 8 weeks.
For this my understanding is that the repeated measures t-test
is right.
I want to also compare the results of this group receiving
treatment with a control...

2. What aspect does the repeated measure test decrease when
compared to an independent t test?
4. A within design uses a _______ test statistic and a between
design uses a _______ test statistic.
a. independent/paired
b. one sample/paired
c. paired/independent
d. one sample independent
6. A between design is when ________.

A repeated-measures experiment and an independent-measures
experiment both produce t statistics with df = 20. How many
individuals participated in each experiment?
Select one:
a. n = 21 for independent-measures and n
= 11 for repeated measures
b. n = 22 for independent-measures and n
= 21 for repeated measures
c. n = 21 for independent-measures and n
= 21 for repeated measures
d. n = 22 for independent-measures and n
= 11 for repeated measures

A repeated-measures research design tends to have which of the
following drawbacks?
the possibility for extraneous variables that occur over the
passage of time to influence results
the need for a larger sample size
less of an ability to control the extent to which individual
differences among research participants influence results
the need to provide more evidence to support statistical
significance than other research designs

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