Jenny Clift Gena Omelyaneko
Tori Langan
BackgroundThe first TV commercial was
broadcasted on July 1, 1941 It was on the New York station
WNBTThe ad was ten seconds long
and advertised a watchmakerThe cost of a commercial
depends on the number of viewersThe cost of a 30 second ad
during the 2010 Super bowl, one of the most watched programs, cost 2.6 millions dollars
Procedure
Watched TV commercials on different channels during different times and recorded their types and how many for eachWatched Food network and ABC to compare number of
food commercials for eachWe each watched one network (ABC, NBC, or CBS) and
cited the types of commercials and their numbersCollected all of the recorded female commercials for both
daytime and primetime (on NBC) and compared
Assumptions for 1st Test
State Check
1. 2 independent SRS2. n₁p₁ ≥ 10
n₁ (1-p₁) ≥ 10n₂p₂ ≥ 10n₂(1-p₂) ≥ 10
3. pop. (1) ≥ 10n₁pop. (2) ≥ 10n₂
*Not all assumptions pass, but we will continue with the test.
Food Channel vs. ABC
2 proportion z-testHo: P1 = P2Ha: P1 > P2
z=3.6529
p(z > 3.6529) = 1.2967 x 10^-4
We reject Ho because our p-value < α=0.05. We have sufficient evidence that the proportion of food commercials on Food network is greater than the proportion of food commercials on ABC.
P1= Food ChannelP2= ABC
Visual Statistics, Analysis, and Conclusion (1st Test)There were overall a
greater number of commercials recorded on the Food network
The Food network did, in fact, have a larger number of food commercials than ABC did
We were surprised by how little food commercials there were when compared to the total number
10
20
30
40
50
60
N Y
ABC
count
Collection 3 Bar Chart
10
20
30
40
50
60
70
80
90
N Y
Food_N
count
Collection 3 Bar Chart
Assumptions for 2nd Test
State Check
1. 2 independent SRS2. n₁p₁ ≥ 10
n₁ (1-p₁) ≥ 10n₂p₂ ≥ 10n₂(1-p₂) ≥ 10
3. pop. (1) ≥ 10n₁pop. (2) ≥ 10n₂
*Not all assumptions pass, but we will continue with the test.
Female-based commercials on NBC:Daytime vs. Primetime
2 proportion z-testHo: P1 = P2Ha: P1 < P2
z=-.6289
p(z < -.6289) = .2647
We fail to reject Ho because our p-value > α=0.05. We have sufficient evidence to say that there is an equal amount of female commercials during the daytime block and during the primetime block.
P1= # of female commercials during daytimeP2= # of female commercials during primetime
Visual Statistics (2nd Test)
10
20
30
40
50
60
70
N Y
Day
count
Collection 1 Bar Chart
10
20
30
40
50
60
70
80
N Y
Night
count
Collection 1 Bar Chart
Analysis and Conclusion (2nd Test)
The bar graphs for the primetime and daytime were almost identical in ratings
Although the primetime block had more commercials shown, the proportions between the no’s and the yes’s for both times was very similar
Assumption for 3rd Test
1. SRS2. All expected counts >
(or equal to) 5
1. Not SRS2. Not all counts > (or
equal to) 5
*Not all assumptions pass, but we will continue with the test.
State Check
NBC, ABC, CBSChi-square TestHo: The channel and the type of commercial shown are independentHa: The channel and the type of commercial shown are dependent
= (6-9)² + (9-4.34)² + … = 30.259 9 4.34
P(χ ² > 30.259 / df = 12) = .0026
We reject Ho because our p-value < α=0.05. We have sufficient evidence to say that the channel and the type of commercial shown are dependent, therefore some channels specifically show more of one type of commercial than others.
Visual Statistics (3rd Test)
Analysis and Conclusion (3rd Test)
According to the overall bar graph for the three networks, NBC had at least ten more insurance commercials than CBS and ABC
Another notable difference: CBS had virtually no female-based commercials shown during the allotted time
For the most part, the other and the other shows categories were fairly similar in all three
Bias and Error
We only watched certain shows, and they were not picked at random
The channels we watched were not picked at random(ABC, NBC and CBS) but they are the major networks
Differences in half-hour shows and hour shows could have an effect on the results
Another affect could be weekend vs. weekdayA show we watched for two hours had an effect on the
results because it was a golfing tournament and ¾ of the commercials were focused on men
Application to Population and Personal OpinionsOur conclusion about this project was not as straightforward
and accurate as it could have been. Watching at the same exact times as the other members
of our group could have made the results more accurate. It also tended to get very boring watching daytime shows
on the networks during the weekend. We assumed that during the daytime there would be more
female-based commercials, and it ended up being an equal amount between the blocks.
The population’s results may or may not be different because of different networks across the state and country.
Conclusion
All in all…The Food Network does indeed have an increased
number of food commercials over the average network (NBC)
Female-based commercials rate equally in the daytime and primetime blocks
And even though ABC, CBS, and NBC are all the top-dog networks and are similar in our minds, our study’s results prove that the channels show more of one type of commercial over other types.