After a series of tropical storms, prices of many essential items were higher; authorities claim gasoline price gouging. The following table shows the average price (in cents) of a gallon of gasoline after and before the storms.
Is there strong evidence that supports authorities claim? Test with $\alpha$=0.05.

Question

After a series of tropical storms, prices of many essential items were higher; authorities claim gasoline price gouging. The following table shows the average price (in cents) of a gallon of gasoline after and before the storms.
  Is there strong evidence that supports authorities claim? Test with $\alpha$=0.05.

Quizplus · Accepted Answer

The Answer of After a series of tropical storms, prices of many essential items were higher; authorities claim gasoline price gouging. The following table shows the average price (in cents) of a gallon of gasoline after and before the storms.
  Is there strong evidence that supports authorities claim? Test with $\alpha$=0.05.

After a Series of Tropical Storms, Prices of Many Essential α\alphaα

After a Series of Tropical Storms, Prices of Many Essential $\alpha$