Question

1. A researcher is comparing scores from two treatment groups
using independent samples *t* test. Use a Hartley’s
*F*-max test to examine this assumption (each group has 6
participants, s^{2} in group 1 is 20, and s^{2} in
group 2 is 15, set alpha level at .05). Also, how should this
researcher estimate the standard error in the independent samples
*t* test?

Answer #1

The number of participants is n=6

Variance of group 1=20

Variance of group 2=15

=0.05, given

Now the test statistic is given by

The critical value is obtained from the Biometrika table is given by

As the value is close to 1 and again the observed value is less than the critical value, it can be concluded that the variances are homogeneous at 5% level of significance.

Standard error in the sample is estimated by

Hopefully this will help you. In case of any query, do comment. If you are satisfied with the answer, give it a like. Thanks.

A researcher used an independent sample t test to compare two
treatment conditions. He wanted to test whether there is a
significant difference between two treatments. Following data were
obtained:
Treatment one group: # of participants = 12, sample mean = 55,
sample standard dev (s) = 2.83
Treatment two group: # of participants = 12, sample mean = 52,
sample standard dev (s) = 2.00
Use 5% significance level.
Assume µ1
and µ2 are the population means for group one
and...

A researcher used an independent sample t test to
compare two treatment conditions. He wanted to test whether there
is a significant difference between two treatments. Following data
were obtained:
Treatment one group: # of participants = 12, sample
mean = 55, sample standard dev (s) = 2.83
Treatment two group: # of participants = 12, sample
mean = 52, sample standard dev (s) = 2.00
Use 5% significance level. Assume µ1
and µ2 are the population means for group...

A researcher is interested in comparing two medications in
order to see which contributes to the greatest decrease in symptoms
as measured by an instrument on a scale of 0-100. The researcher
recruits three groups of participants, one who receive medication
A, one group of participants who receive medication B, and a
control group who receives a placebo.
A. What type of study design is this (descriptive,
correlational, or experimental)?
B. What would be the appropriate statistical analysis to use...

1) A researcher is running an experiment on the effectiveness of
three different energy drinks. She randomly selects 60 individuals
from the population and evenly splits them into three groups, each
of which consumes a different energy drink.
a. The null hypothesis for this test is that at least one of the
three groups will be different. True or False?
The statistical results of the test are as follows: F(2, 47) =
6.24, p < .05.
b. In the above...

HW 6: z-test, t-test for independent samples, t-test for related
samples, 1-way ANOVA
Researchers wanted to explore different treatment methods to
effect memory skills in high school freshmen. Subjects were given a
memory test (under multiple conditions) these were the results:
Group 1
10, 8, 9, 11,
8, 9, 7, 6,
9, 8
Group 2
12, 10,
11, 9, 13, 8, 9, 12, 11, 11
Group 3
10, 9, 10, 9, 11,
8, 7, 9, 10, 11...

Which of the following is appropriate for a related-samples
t test?
A researcher wants to compare the level of honesty (based on an
honesty scale) in politicians to the level of honesty in
students
A researcher wants to compare the scores on a optimism measure
between two universities
A researcher wants to examine the association between liking for
energy drinks and tendency to be a “morning person” among a group
of students
A researcher wants to compare the level of...

An independent-samples t test is performed on the
samples below:
Sample 1: M = 24.1, s2 = 32.02,
n = 10
Sample 2: M = 19.4, s2 = 44.46,
n = 10
a.)Calculate the standard error for the t test
(sM1-M2). (Round to 4 decimal
places.)
b.)Calculate the degrees of freedom for the t test.
c.)Find the critical value of t with two tails and
alpha = 0.05. (Keep 3 decimal places.)
d.)Calculate the t test. (Round answer to two decimal
places.)

An experiment consists of three groups (Treatment Group 1,
Treatment Group 2, Placebo Group). What test was MOST likely
used?
Repeated Measures T-test
Z-test
Single Sample T-test
ANOVA
The population mean difference for a T-test of Independent
Samples is ALWAYS
0
1
equal to the population mean minus the sample mean
can't answer/not enough information
A research study reported a LARGE effect size of .8. What effect
size formula was used?
Scheffe
Cohen's D
Tukey
Correlation
.10
.001
.05
.5

1. A one-factor ANOVA for independent samples conducted on 4
experimental groups, with n = 8 participants in each group,
produces the following partial outcomes: SSbetween = 36, SSwithin =
84. For this analysis, what is the computed F statistic?
A. F = 3
B. F = 12
C. F = 8
D. F = 6
E. F = 21
F. F = 4
2. A researcher reports an outcome of one factor ANOVA for
independent samples as F(2, 36)...

A researcher conducts a study in which the population variance
of difference scores between two groups is unknown. What type of
t-test is most appropriate for this study? Question 8 options:
one–independent sample t-test two–independent sample t-test related
samples t-test There is not enough information to answer this
question.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 11 minutes ago

asked 12 minutes ago

asked 15 minutes ago

asked 18 minutes ago

asked 19 minutes ago

asked 24 minutes ago

asked 44 minutes ago

asked 47 minutes ago

asked 52 minutes ago

asked 55 minutes ago

asked 58 minutes ago

asked 1 hour ago