Information Use the following scenario for questions 1 through 13: In a study of
ID: 2945940 • Letter: I
Question
Information Use the following scenario for questions 1 through 13: In a study of the legibility and visibility of highway signs, a Pennsylvania research firm determined the maximum distance (in feet) at which each of 30 drivers could read a newly designed sign. The 30 participants were volunteers and ranged in age from 18 to 82 years old. The government agency that funded the research hoped to improve highway safety for older drivers and wanted to examine the relationship between age and the sign legibility distance. A scatterplot of the data is shown below. The sample correlation coefficient is r-0.801 and the least-squares regression line is y 576.68-3.01xExplanation / Answer
Answer 1:
Highway signs are the observational units because information is received on it.
Answer 2:
Age - Explanatory variable
Maximum distance at which a highway sign was read - Response variable
Answer 3:
Linear form
Strong Strength
Negative direction
Not present unusual observation
Answer 4:
Coefficient of determination, r-square = (-0.801)^2 = 0.642 or 64.2%
Answer 5: