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.