{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

ps3_2010

# ps3_2010 - STAT 203 PROBLEM SET 3(1 An economist studying...

This preview shows pages 1–2. Sign up to view the full content.

STAT 203 PROBLEM SET 3 (1) An economist studying the relation between household electricity consumption ( Y ) and number of rooms in the home ( X ) employed linear regression model and obtained residuals listed in ±le Electric- ityConsumption.txt . Plot the residuals versus X . What problem appears to be present here? Might a transformation alleviate this problem? (2) RABE Problem 7.4. (3) This problem uses data from a study of computer-assisted learning by 12 students, showing the total number of responses in completing a lesson ( X ) and the cost of computer time ( Y , in cents). (a) Fit a linear regression function by ordinary least squares. Ob- tain the residuals, and plot the residuals against X . What does the residual plot suggest? (b) Plot the absolute values of the residuals against X . What does this plot suggest about the relation between the standard devi- ation of the error term and X ? (c) Estimate the standard deviation function by regressing the ab-

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 2

ps3_2010 - STAT 203 PROBLEM SET 3(1 An economist studying...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online