About 5% of cars built after 2007

About 5% of cars built after 2007 fail their smog test with a standard deviation of 1.7. A car company is being reviewed by the EPA for failing to design their cars according to the latest emission standards. A random sample from California drivers (who own the make and model under review) found that on average the cars failed at a rate of 20% with a standard deviation of 4.5. Which hypothesis test should be used to determine whether the sample contains more than the average car built after 2007? A. z-test for the population mean B. t-test for the population mean C. This cannot be solved without the population standard deviation D. z-test for the population proportion SCIENCE HEALTH SCIENCE NURSING NURS 8119

******CLICK ORDER NOW BELOW AND OUR WRITERS WILL WRITE AN ANSWER TO THIS ASSIGNMENT OR ANY OTHER ASSIGNMENT, DISCUSSION, ESSAY, HOMEWORK OR QUESTION YOU MAY HAVE. OUR PAPERS ARE PLAGIARISM FREE*******."