The average speed of a human riding a bicycle over the course of an hour was 13 mph in 2015. Ten average riders were used to gather average mph speeds over the course of an hour. The times are: 11, 16, 10.5, 12, 9, 11.5, 13, 17, 15.5, and 12. With a standard deviation of 2 and an alpha of 0.5, determine the Z and P value to see if we accept or reject the Null Hypothesis (Ho) for the average speeds of bicycle riders over the course of an hour in relation to the average speed (13 mph) from 6 years ago.