According to state troopers, the mean speed on the Western Virginia Turnpike is 72 miles per hour. Representatives for the local motorist club simply disagree, acknowledging the actual mean spead might be slower or faster; they commission a sample of size 36, and from it is calculated a sample mean of 73.5 miles per hour. According to industry standards, the population standard deviation is acceptably assumed to be 4 miles per hour. Test the claim at a 98% level of confidence. WHAT IS THE UPPER AND LOWER BOUND OF THE CONFIDENCE INTERVAL??