{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Econ120BCh4

# Econ120BCh4 - Chapter 4 Answers 4.1 4.2 4.3 4.6 4.9 4.11...

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

Chapter 4 Answers 4.1, 4.2, 4.3, 4.6, 4.9, 4.11, 4.12 1. (a) The predicted average test score is ± 520 4 5 82 22 392 36 TestScore (b) The predicted change in the classroom average test score is ± ( 5 82 19) ( 5 82 23) 23 28 TestScore       (c) Using the formula for 0 ˆ in Equation (4.8), we know the sample average of the test scores across the 100 classrooms is 0 1 ˆ ˆ 520 4 5 82 21 4 395 85 TestScore CS   (d) Use the formula for the standard error of the regression (SER) in Equation (4.19) to get the sum of squared residuals: 2 2 ( 2) (100 2) 11 5 12961 SSR n SER Use the formula for 2 R in Equation (4.16) to get the total sum of squares: 14088 08 . 0 1 12961 1 2 R SSR TSS The sample variance is 2 Y s 14088/99 = 142.3. Thus, standard deviation is 11.93 2. The sample size The estimated regression equation is 200. n ± 2 (2 15) 99 41 (0 31) 3 94 0 81 SER 10 2 Weight Height R  

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 / 3

Econ120BCh4 - Chapter 4 Answers 4.1 4.2 4.3 4.6 4.9 4.11...

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

View Full Document
Ask a homework question - tutors are online