Question

To compare the effectiveness of a media campaign - via radio ads, billboards, and ads on social media websites - to reduce the incidence of impaired driving, a police chief inspected data from 60 randomly chosen CheckStops at varying locations.Thirty of these were before the launch of this campaign, 30 were after the media campaign had been running for a months time. Use α=0.05 for all calculations. For each CheckStop randomly chosen, the number of people charged with impaired driving was recorded:

Prior: 4, 8, 5, 5, 1, 5, 11, 5, 11, 13, 12, 11, 5, 4, 11, 6, 9, 4, 8, 12, 5, 11, 13, 10, 8, 3, -1, 9, 12, -1;

After: 2, 5, 2, 4, 7, 6, 7, 6, 4, 4, 3, 5, 6, 7, 2, 4, 7, 4, 3, 2, 4, 7, 7, 4, 7, 7, 8, 5, 2, 12;

(a) Does this data suggest that the variation in the number of impaired driving charges before the campaign is equal to the variation in the number of impaired driving charges after the campaign has been running for a month? From the appropriate statistical test, find the value of the test statistic.

Test Statistic=

Report the p-value of the test you ran in (a), using at least three decimals in your answer.

P-value=

I tried the test statistic=2.5874 which means p-value=0.01291 Apparently that's wrong. Any help is appreciated.

Answer #1

To compare the effectiveness of a media campaign - via radio
ads, billboards, and ads on social media websites - to reduce the
incidence of impaired driving, a police chief inspected data from
60 randomly chosen CheckStops at varying locations. Thirty of these
were before the launch of this campaign, 30 were after the media
campaign had been running for a months time. Use α=0.05 for all
calculations. For each CheckStop randomly chosen, the number of
people charged with impaired...

To compare the effectiveness of a media campaign - via radio
ads, billboards, and ads on social media websites - to reduce the
incidence of impaired driving, a police chief inspected data from
60 randomly chosen CheckStops at varying locations.Thirty of these
were before the launch of this campaign, 30 were after the media
campaign had been running for a months time. Use α=0.05α=0.05 for
all calculations.
For each CheckStop randomly chosen, the number of people charged
with impaired driving...

A manager wishes to find out whether there is a relationship
between the number of radio ads aired per week and the amount of
sales (in thousands of dollars) of a product. The data for the
sample follow.
# of ads, x
2
5
8
8
10
12
Sales, y
$2
$4
$7
$6
$9
$10
1. The alternative hypothesis would be:
2. The test is 2-tailed and the degrees of freedom are 4.
True
False
3. If α =...

ROMI= (Increase in Sales – Marketing Campaign Cost) / Marketing
Campaign Cost The figures from Veronica show that revenue before
each campaign was $12,000. The cost of each campaign and subsequent
revenues are as follows: Television Campaign cost: $3,000 Revenue
after campaign: $16,000 Social Media (Facebook, Twitter, YouTube,
and LinkedIn) Campaign cost: $12,000 Revenue after campaign:
$30,000 Website Campaign cost: $5,000 Revenue after campaign:
$18,000 ABCD 1 2 3 4 5 6 7 8 Television Social Media Website
Revenues Before...

Using the methods in Section 11.1, test the hypothesis (α =
0.05) that the population proportions of red and brown are equal
(pred = pbrown). You are testing if their proportions are equal to
one another. NOTE: These are NOT independent samples, but we will
use this approach anyway to practice the method. This also means
that n1 and n2 will both be the total number of candies in all the
bags. The “x” values for red and brown are...

A city wants to know if a new advertising campaign to make
citizens aware of the dangers of driving after drinking has been
effective. They count the number of drivers who have been stopped
with more alcohol in their systems than the law allows for each day
of the week in the week before and the week a month after the
campaign starts. Let Di be the difference between the
number of drivers caught with excessive alcohol in their systems...

To test the effectiveness of a lesson, a teacher gives randomly
selected students a pretest and follow-up test. The results are
given below.
Student
A
B
C
D
E
F
G
H
Before
6
8
5
4
3
5
4
7
After
9
10
8
7
6
8
7
10
(a) At the 0.025 significance level, test the claim that the
lesson was effective.
Original claim is made by Answer hypothesis.
Original claim is: ud Answer 0.
Test statistic: Answer...

A study was conducted to investigate the influence of a driver's
age, number of driving years and attention span (the higher, the
more detailed) on the number of speeding tickets within the last
five years. Given a driver at age 30, who has been driving for 10
years with an attention span score of 5, what is the number of
tickets that can be expected?
TICKETS
AGE
YEARS
SPAN
8
32
16
7
6
35
19
10
5
24
10...

Problem 1: 25 patients with blisters were
randomly assigned to treatment A, treatment B and Placebo; the
number of days until the blisters heal were recorded. Are these
treatments significantly different? Use α = 5%.
Treatment A
5
6
6
7
7
8
9
10
Treatment B
7
7
8
9
9
10
10
11
Placebo
7
9
9
10
10
10
11
12
13
Sample size (n)
Median
Mean
Standard Deviation (S)
Treatment A
8
7
7.250
1.669
Treatment...

Bag
Blue
Orange
Green
Yellow
Red
Brown
Total Number of Candies
1
7
23
9
11
4
6
60
2
16
16
4
7
9
4
56
3
14
14
3
10
5
11
57
4
13
14
7
8
8
6
56
5
18
12
7
10
5
7
59
6
12
9
11
9
8
8
57
7
15
16
6
6
6
8
57
8
15
17
8
4
6
7
57
9
12
14
10
5...

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