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Class 27. Example: Height and Weight Case: Colonial Broadcasting (HBS: 9-894-011). Heights and Weights of n=30 11-year-old girls. Al used the regression of KG on CM to forecast the weight of a girl 144.8 cm tall. Al’s point forecast was _______________. Sample Means. The regression line.

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Class 27

Class 27

Example: Height and Weight

Case: Colonial Broadcasting(HBS: 9-894-011)


Heights and weights of n 30 11 year old girls
Heights and Weights of n=30 11-year-old girls

Al used the regression of KG on CM to forecast the weight of a girl 144.8 cm tall.

Al’s point forecast was _______________

Sample Means


The regression line

Always goes thru

Any three can be used to find the fourth.


Heights and weights of n 30 11 year old girls1
Heights and Weights of n=30 11-year-old girls

Bo regressed KG on inches. Which model will be the better predictor of KG?

Al’s

Bo’s

They should give identical results.

Sample Means





Colonial broadcasting company
Colonial Broadcasting Company per inch?

  • Three Networks

    • ABN, BBS, CBC

  • Data from 88 made-for-TV movies (1992)

  • CBC wants to know what factors affect the movie’s Rating. (the percent of US households with TVs tuned into a program)

  • CBC needs to forecast the rating of a proposed movie.


1a. Rank the networks based on average 1992 rating. per inch?

1b. How big was the ratings gap between the top and bottom ranked networks?


2a. What is the average rating of fact based movies? per inch?

2b. Is the difference in fact and fiction ratings statistically significant?


3. Which is most true? per inch?

fact-based movies had fewer stars (than fictional movies)

Fact-based movies had more stars.

Fact-based movies had the same number of stars.

Cannont be determined.


4. On Sunday night, CBC usually airs “ per inch?Josette and Yvette” at 8 pm followed by the Sun night movie. “J&Y” typical get a 17.5 rating. If they replace “J&Y” with a rock concert expected to get a rating of 20, what is the expected change in the movie rating?


5. A high-ranking CBC exec argued that network programming does not affect total size of network audience, only the relative share each network receives. Does the regression support or refute this assertion?


6. BBS’s new movie is fiction- based with 2 stars. We don’t know when it will be aired. Will it’s rating exceed the 1992 average for BBS movies?


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