. The average wind speed in Casper,WY, has been found to be 12.7 mph, and in Phoenix, AZ, it is 6.2mph. To test the relationship between the averages, the averagewind speed was calculated for a sample of 31 days for each city.The results are reported below. (15 pts)
| Casper | Phoenix |
Sample size n | 31 | 31 |
Sample mean x? | 12.85 mph | 7.9 mph |
Population standard deviation ? | 3.3 mph | 2.8 mph |
Is there sufficient evidence at ? = 0.05 to conclude that theaverage wind speed is greater in Casper than in Phoenix? Completethe hypotheses H1, a summary of your answer, and drawthe normal curve.
H0: ?1 =?2 ? =0.05 C.V. = ________
H1: ?1 ?2 (claim)
