DS212_HW3_Solutions

# DS212_HW3_Solutions - DS 212 Business Statistics Soorapanth...

This preview shows pages 1–4. Sign up to view the full content.

DS 212 Business Statistics Soorapanth Homework #3: Chapter 12 Simple Regression Analysis and Correlation 12.6 x y 12 17 21 15 28 22 8 19 20 24 0 5 10 15 20 25 30 0 5 10 15 20 25 30 x Σ x = 89 Σ y = 97 Σ xy = 1,767 Σ x 2 = 1,833 n = 5 The equation of the regression is y ˆ = 16.51 + 0.162 x 1 1 1 2 2 1 0 1 0.162 ( ) 16.51 n i i i n i i x y nx y b x n x b y b x = = - = = - = - =

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

View Full Document
DS 212 Business Statistics Soorapanth 12.7 x _ _ y _ 140 25 119 29 103 46 91 70 65 88 29 112 24 128 Σ x = 571 Σ y = 498 Σ xy = 30,099 Σ x 2 = 58,293 n = 7 The equation of the regression is y ˆ = 144.414 – 0.898 x 2 1 1 2 2 1 0 1 0.898 ( ) 144.414 n i i i n i i x y nx y b x n x b y b x = = - = = - - = - =
DS 212 Business Statistics Soorapanth 12.8 (Advertising) x (Sales) y 12.5 148 3.7 55 21.6 338 60.0 994 37.6 541 6.1 89 16.8 126 41.2 379 Σ x = 199.5 Σ y = 2,670 Σ xy = 107,610.4 Σ x 2 = 7,667.15 n = 8 The equation of the regression is y ˆ = -46.292 + 15.24 x 12.11 No. of Farms ( x ) Avg. Size ( y

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.

## DS212_HW3_Solutions - DS 212 Business Statistics Soorapanth...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online