Question

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 appropriate test statistic?

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

**b)**

Condition 1:

---Select--- before smoking after advertising campaign
cigarettes

Condition 2:

---Select--- before smoking after advertising campaign
cigarettes

**c)** Obtain/compute the appropriate values 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.

There was a significant decrease in cigarettes smoked after the ad.

There was a significant increase in cigarettes smoked after the ad.

There was no significant difference between the number of cigarettes smoked before and after the ad.

Answer #1

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 three weeks after exposure to the ad. What
can be concluded with α = 0.05. The data are below.
before
after
46
17
21
34
31
20
34
26
27
41
35
17
12
29
29
19
27
26
16
41
a) What is the...

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?...

Researchers hypothesize that a new oral contraceptive will
produce weight gain. In a study, healthy females were weighed (lb)
at the beginning of a course of the new oral contraceptive. They
were reweighed at 3 months. What can the researchers conclude with
an α of 0.01? The data are below.
initial weight
3-month weight
140
117
137
130
140
158
147
145
141
140
150
119
144
141
144
163
146
145
151
144
a) What is the appropriate 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...

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 study was conducted using undergraduates at a rural university
who volunteered to participate in the research as partial
fulfillment of a course requirement. One of the items studied was
the amount of alcohol consumed (in drinks) in any one day for the
past month. Administrators want to know if there are differences in
alcohol consumption between freshmen and juniors. Based on the
information in the table below, what can be concluded with α =
0.05?
freshmen
juniors
1 =...

The Board of Trustees believe that test anxiety is increased by
the time spent in college. After completing their sophomore year, a
random sample of students was selected and given the College Test
Anxiety Questionnaire (CTAQ). After completing their senior year
they were again tested. What can be conclude with α =
0.05?
sophomore
senior
5.9
7.2
7.4
6.8
8.5
6.2
6.1
5.2
2.1
7.5
3.2
6.3
5.5
6.4
4.6
5.2
a) What is the appropriate test statistic?
---Select: na,...

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.)...

Dr. Chase wants to investigate how cell phone use impacts
reaction time. To test this, Dr. Chase conducted a study where
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instructed to complete a driving simulator course where reaction
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Dr. Yan predicts that a novel antidepressant drug improves
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completion time was 48 seconds. Normal rats have an average
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What can be concluded with an α of 0.10? )
What is the...

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