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 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 appropriate test statistic?

---Select: na, z-test, One-Sample t-test, Independent-Samples
t-test, or Related-Samples t-test

**b)**

Condition 1:

---Select: before, advertising, campaign, after, or smoking
cigarettes

Condition 2:

---Select: before, advertising, campaign, after, or smoking
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, or large effect

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

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

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

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

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

Answer #1

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 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
participants are randomly assigned to one of two conditions while
driving: no cell phone or cell phone. Participants were then
instructed to complete a driving simulator course where reaction
times (in milliseconds) were recorded by how quickly they hit the
breaks in response to a dog crossing the middle of the road during
the course. Below are the data....

Dr. Yan predicts that a novel antidepressant drug improves
cognition. To examine this, the drug is administered to a random
sample of 28 trained rats. The rats were then placed in a maze and
timed on how long it took them to complete it. The average
completion time was 48 seconds. Normal rats have an average
completion time of 44 seconds with a variance of 100.00 seconds.
What can be concluded with an α of 0.10? )
What is the...

Generally, the average typing speed is 56 words per minute (wp).
A professor wanted to see where his students stand compared to the
population. He tested 24 of his students and obtained the following
estimates: an average typing speed of 58 with a variance of 361.00.
What can the professor conclude with α = 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
Also state population and sample from choices below
Population:...

Vita Pills were advertised as having 751 mg of vitamin B3 per
pill. A marketing firm hypothesizes that the amount of vitamin B3
is less than what is advertised. What can be concluded with α =
0.10. The vitamin B3 content per pill from a sample of pills is as
follows:
713, 761, 716, 721, 751, 721, 711, 741.
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--- sample of...

Application Exercise:
In a fast food company, all male employees with 3 to 5 years of
experience have an average salary of $27900 with a with a standard
deviation of $5090. A random sample of 27 female employees also
having 3 to 5 years of experience had an average salary of $27200.
The company accountant suspects a different in salary practices for
males and females. What can be concluded with an α of
0.10?
a) What is the appropriate test...

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?...

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