Question

1. The U.S. Department of Transportation wants to see if there is a relationship between motor vehicle fatality rate (units=fatalities per 1000 licenses) and the percentage of licensed drivers over 21 (units=10%). A regression analysis on 11 cities revealed Σx_i = 93.50, Σx²_i = 794.89, Σy_i = 31.90, Σy²_i = 100.27, and Σx_iy_i = 270.12.

   What is the interpretation of β₁?

   	a.	For an increase of 0.001 fatalities/license in the motor vehicle fatality rate, the average percentage of licensed drivers over 21 decreases by 0.7357%.
   	b.	None of the answers is correct
   	c.	For an increase of 10% in percentage of licensed drivers over 21, the average motor vehicle fatality rate decreases by 0.0074 fatalities/license.
   	d.	For an increase of 10% in percentage of licensed drivers over 21, the average motor vehicle fatality rate decreases by 0.1327 fatalities/license.
   	e.	For an increase of 0.001 fatalities/license in the motor vehicle fatality rate, the average percentage of licensed drivers over 21 decreases by 7.3571%.

Answer 1

ANSWER::

Slope is negative:: -7.3571

Option:: (e) is correct..........

Ans: For an increase of 0.001 fatalities/license in the motor vehicle fatality rate, the average percentage of licensed drivers over 21 decreases by 7.3571%.

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