Testing cars A clean air standard requires that vehicle exhaust emissions not exceed specified limits for various pollutants. Many states require that cars be tested annually to be sure they meet these standards. Suppose state regulators double-check a random sample of cars that a suspect repair shop has certified as okay. They will revoke the shops license if they find significant evidence that the shop is certifying vehicles that do not meet standards. a) In this context, what is a Type I error? b) In this context, what is a Type II error? c) Which type of error would the shops owner consider more serious? d) Which type of error might environmentalists consider more serious?
Stats 260, 11/15 Class Announcements ● Next homework is out! Due 11/29 (only five questions) ● Blackboard test grade is the correct one, not testing services ● Scatter plots are in chapter two of book if you need to review Notes ● Correlation Coefficient: Statistical measure of how strong a relationship between two variables is. ○ Will run between 1 and 1. If it is negative, you have a negative linear slope. ○ Perfect linear correlation would mean all of your data would line up perfectly on a straight line. THe data is exactly linear. ○ Perfect positive linear relationship = 1 ○ Perfect negative linear relationship = 1 ○ You can tell by looking at the scatter plot if a relationshi