Final answer:
The LSRL equation is y = 9.9836 - 0.1199x. 70.96% of the variation in car crashes is explained by the linear relationship to video testimonials. Texting and driving videos have a significant impact on decreasing car accidents.
Step-by-step explanation:
Part A: The LSRL (Least Squares Regression Line) can be determined by using the coefficients obtained from the computer output. The equation for the LSRL is:
y = 9.9836 - 0.1199x
The variables used in the equation are:
- Intercept: The value of y when x is equal to 0
- Testimonials: The slope of the line, representing the change in y for a one unit increase in x
Part B: The coefficient of determination, also known as r-squared, is 70.96%. This means that approximately 70.96% of the variation in car crashes can be explained by the linear relationship to video testimonials. The remaining 29.04% is attributed to other factors not included in the regression model.
Part C: To determine if decreased accidents were caused by texting and driving videos, we can analyze the P-value associated with the coefficient for Testimonials. The P-value of 0.0353 is less than the commonly used significance level of 0.05, indicating that the coefficient is statistically significant. Therefore, there is evidence to suggest that texting and driving videos have a significant impact on decreasing car accidents.