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# Class 27 - PowerPoint PPT Presentation

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

Example: Height and Weight

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

Always goes thru

Any three can be used to find the fourth.

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

### How would you use these data to estimate the number of CM 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.

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

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)