Suppose, a machine making hand sanitizer uses alcohol. Every 100 ml bottle of hand sanitizer should have 10 ml of alcohol. However, you suspect the machine is pouring more than 10 ml of alcohol. So, you sample 40 bottles and the average alcohol in them were 12 ml. You also find that the variance is 4. At 99% confidence level, test if the machine pours more than 10 ml of alcohol.