(a) The average wind speed in a city is 8 miles per hour. To check if there is any change in the wind speed, a researcher took a sample of wind speeds over 36 days for which he had found that the average wind speed was 8.2 mile per hour. If the standard deviation of the population is 0.6 miles per hour, at = 0.05, is there any change in the wind speed? [CV = 1.96] [5]