Question

A political scientist hypothesizes that a political ad will
reduce attitudes about a particular issue. The scientist randomly
asks 31 individuals walking by to see the ad and then take a quiz
on the issue. The general public that knows little to nothing about
the issue, on average, scores 50 on the quiz. The individuals that
saw the ad scored an average of 53.59 with a variance of 25.70.
What can the political scientist conclude with an α of 0.05?

**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--- individuals walking by general public the ad the
political ad the particular issue

Sample:

---Select--- individuals walking by general public the ad the
political ad the particular issue

**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/or 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.

Individuals that watched the political ad scored significantly higher on the quiz than the general public.

Individuals that watched the political ad scored significantly lower on the quiz than the general public.

Individuals that watched the political ad did not score significantly different on the quiz than the general public.

Answer #1

Application Exercise:
A physician hypothesizes that males have higher systolic blood
pressure than females. The physician obtains a sample of patients
and measures their blood pressures during their regular check-up.
Below is the systolic blood pressure for the sample. What can the
physician conclude with α = 0.01?
male
female
106
119
98
105
100
132
109
113
98
105
137
115
119
115
127
122
131
124
111
136
a) What is the appropriate test statistic?
---Select--- na z-test...

A doctor hypothesizes that females have higher systolic blood
pressure than males. The doctor obtains the blood pressure from a
sample of patients during their annual check-up. Below is the
systolic blood pressure for the sample. What can be concluded with
α = 0.05?
male
female
106
119
98
105
100
132
109
113
98
105
137
105
119
115
127
122
131
124
111
136
a) What is the appropriate test statistic?
---Select--- na z-test One-Sample t-test Independent-Samples t-test...

The mean height of adult males in the U.S is about 68.2" with a
variance of 16.00". Suppose the mean height of a sample of 30
mentally disabled males was found to be 69.6". Researchers want to
know if the height of mentally disabled males differs from the
population. What can be concluded with α = 0.01?
a) What is the appropriate test statistic?
---Select from the options--- na z-test, one-sample t-test,
independent-samples t-test, related-samples t-test
b)
Population:
---Select from...

For each of the following sets of results, compute the
appropriate test statistic, test the indicated alternative
hypothesis, and compute the effects size(s) indicating their
magnitude:
set
hypothesis
1
2
D
n
α
a)
μ1 ≠ μ2
32.7
38
4.5
24
0.10
b)
μ1 > μ2
101.3
96
9.6
26
0.01
c)
μ1 < μ2
75.2
75.4
6.8
24
0.05
a)
Compute the appropriate test statistic(s) to make a decision about
H0.
critical value = ; test statistic =
Decision: ---Select--- Reject...

A developmental psychologist hypothesizes that drinking soda
effects the hyperactivity of children. Children in the experimental
condition were given a can of soda during their afternoon break.
Children in the control condition were not given any soda. The
hyperactivity of the children was measured after the break. Below
are partial SPSS results:
a) Compute the appropriate test statistic(s) to
make a decision about H0.
(Hint: Make sure to write down the null and alternative hypotheses
to help solve the problem.)...

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...

, "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 cigarette company rand an advertising campaign designed to
improve sales. To evaluate their campaign, they had subjects record
the average number of cigarettes smoked per day in the week before
and the week after exposure to the ad. What can be concluded with
an α of 0.05. The data are below.
before
after
46
25
21
34
31
20
34
26
27
41
35
17
12
29
18
19
27
26
16
41
a) What is the appropriate test...

A national organization ran an advertising campaign designed to
convince people to quit smoking. To evaluate their campaign, they
had subjects record the average number of cigarettes smoked per day
in the week before and one week after exposure to the ad. What can
be concluded with α = 0.05. The data are below.
before
after
35
17
12
29
18
19
27
26
16
41
46
17
21
34
31
20
34
26
27
41
a) What is the...

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:...

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