Question

A school psychologist wants to know if a popular new hypnosis
technique impacts depression. The psychologist collects a sample of
14 students and gives them the hypnosis once a week for two months.
Afterwards the students fill out a depression inventory in which
their average score was 43.04. Normal individuals in the population
have a depression inventory average of 49 with a variance of
144.00. What can the psychologist conclude with an α of 0.01?

**a)** What is the appropriate test statistic?

---Select--- na z-test One-Sample t-test Independent-Samples t-test
Related-Samples t-test

**b)**

Population:

---Select--- normal individuals two months students receiving
hypnosis depression new hypnosis technique

Sample:

---Select--- normal individuals two months students receiving
hypnosis depression new hypnosis technique

**c)** Compute the appropriate test statistic(s) to
make a decision about *H*_{0}.

(Hint: Make sure to write down the null and alternative hypotheses
to help solve the problem.)

critical value = ; test statistic =

Decision: ---Select--- Reject H0 Fail to reject H0

**d)** If appropriate, compute the CI. If not
appropriate, input "na" for both spaces below.

[ , ]

**e)** Compute the corresponding effect size(s) and
indicate magnitude(s).

If not appropriate, input and select "na" below.

*d* = ; ---Select--- na trivial effect small
effect medium effect large effect

*r*^{2} = ; ---Select--- na trivial
effect small effect medium effect large effect

**f)** Make an interpretation based on the
results.

The depression of students that underwent hypnosis is significantly higher than the population.

The depression of students that underwent hypnosis is significantly lower than the population.

The depression of students that underwent hypnosis is not significantly different than the population.

Answer #1

**a)** What is the appropriate test statistic?

Since, we know the population variance, we will use

z-test

**b)**

Population:

normal individuals

Sample:

two months students receiving hypnosis depression new hypnosis
technique

**c)** Compute the appropriate test statistic(s) to
make a decision about *H*_{0}.

*H*_{0} : Mean depression of students that underwent
hypnosis is equal to that of normal students.

*H*_{a} : Mean depression of students that
underwent hypnosis is less than that of normal students.

α of 0.01 critical value = -2.326 ;

Standard error of sample mean = = 3.207135

test statistic z = (43.04 - 49) / 3.207135 = -1.858356

Since the test statistic is not less than -2.326 and hence does
not fall in the critical region, we fail to reject H0.

Decision: Fail to reject H0

**d)** If appropriate, compute the CI. If not
appropriate, input "na" for both spaces below.

Lower limit = 49 - 2.326 * 3.207135 = 41.5402

Upper limit = 49 + 2.326 * 3.207135 = 56.4598

[ 41.5402 , 56.4598]

**e)** Compute the corresponding effect size(s) and
indicate magnitude(s).

If not appropriate, input and select "na" below.

*d* = |43.04 - 49|/ =
0.4967

Since, d lies between 0.20 and 0.50 it is small effect

*r*^{2} = ; na

**f)** Make an interpretation based on the
results.

Since we fail to reject H0,

The depression of students that underwent hypnosis is not significantly different than the population.

A school psychologist believes that a popular new hypnosis
technique increases depression. The psychologist collects a sample
of 23 students and gives them the hypnosis once a week for two
months. Afterwards the students fill out a depression inventory in
which their average score was 49.21. Normal individuals in the
population have a depression inventory average of 49 with a
variance of 121.00. What can the psychologist conclude with an α of
0.01?
a) What is the appropriate test statistic?...

A social psychologist hypothesizes that depression is related to
Facebook use. The psychologist collects hours on Facebook and
depression score data from a sample of clinically depressed
patients. What can be concluded with α = 0.10?
Facebook
depression
3
3
2
5
4
3
4
2
3
4
0
7
9
6
1
11
2
5
a) What is the appropriate statistic?
---Select--- na, Correlation, Slope, Chi-Square
Compute the statistic selected in
a):
b) Obtain/compute the appropriate values to make...

A social psychologist hypothesizes that more Facebook use is
related to less depression. The psychologist collects hours on
Facebook and depression score data from a sample of clinically
depressed patients. What can be concluded with an α of
0.01?
Facebook
depression
3
4
5
4
3
4
2
3
0
7
9
6
1
4
2
5
a) What is the appropriate statistic?
---Select--- na Correlation Slope Chi-Square
Compute the statistic selected in a):
b) Obtain/compute the appropriate values to...

, "Opening up" is thought to improve individuals' mood following
a tragic incident. A health psychologist is interested in its
effect on HIV positive patients. The psychologist collected a
sample of 17 HIV positive patients and asked them to talk about
their HIV related issues ("open up") with their family. The
psychologist assessed the patients' level of hopefulness afterwards
and obtained a mean of 114.58 with a standard deviation of 4.92.
The average hopefulness of HIV positive individuals is known...

A social psychologist hypothesizes that more Facebook use is
related to less depression. The psychologist collects hours on
Facebook and depression score data from a sample of clinically
depressed patients. What can be concluded with an α of
0.01?
Facebook
depression
3
4
5
4
3
4
2
3
0
7
9
6
1
4
2
5
a)Compute the correlation statistic
b) Obtain/compute the appropriate values to make a
decision about H0.
(Hint: Make sure to write down the null...

A sociologist wants to know about the stress levels in the
nation over the past years. In the late 1990s, the average score on
the Brown's Stress Inventory (BSI) in the nation was 18 with a
variance of 51.84. A current day sample of 21 produces a mean BSI
score of 18.5. What can the sociologist concludes with an α of
0.01?
a) What is the appropriate test statistic?
---Select--- na z-test one-sample t-test independent-samples t-test
related-samples t-test
b)
Population:...

A sociologist wants to know about the stress levels in the
nation over the past years. In the late 1990s, the average score on
the Brown's Stress Inventory (BSI) in the nation was 18 with a
variance of 51.84. A current day sample of 21 produces a mean BSI
score of 18.5. What can the sociologist concludes with an α of
0.01?
a) What is the appropriate test statistic?
---Select--- na z-test one-sample t-test independent-samples t-test
related-samples t-test
b)
Population:...

Application Exercise:
A school psychologist wants to know if there is a relationship
between creativity and positive mood. Below are the data from a
random sample of 5th graders. What can be concluded with α
= 0.10?
mood
creativity
1
6
2
6
7
7
5
8
10
9
5
7
6
11
4
5
7
6
5
4
2
8
a) What is the appropriate statistic?
---Select--- na Correlation Slope Chi-Square
Compute the statistic selected in
a):
b) Obtain/compute...

A social psychologist predicts that college students will be
impaired from a self-efficacy program for professional athletes. A
sample of students is drawn from a university whose students have
an average of 54 for self-efficacy. The sample of students goes
through the program for six weeks and afterwards are given a
self-efficacy questionnaire. What can the psychologist conclude
with an α of 0.01? The self-efficacy scores for the sample after
six weeks are:
50, 61, 80, 46, 94, 66, 76,...

A social psychologist predicts that college students will
benefit from a self-efficacy program for professional athletes. A
sample of students is drawn from a university whose students have
an average of 54 for self-efficacy. The sample of students goes
through the program for six weeks and afterwards are given a
self-efficacy questionnaire. What can the psychologist conclude
with an α of 0.01? The self-efficacy scores for the sample after
six weeks are:
50, 61, 80, 46, 94, 51, 37, 85,...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 12 minutes ago

asked 23 minutes ago

asked 23 minutes ago

asked 58 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago