The historical Average rainfall for Albany N,Y is 36.9 inches a year, with standard deviation of 4.3 inches. The average for the last 40 years has been 41.1 inches a year. Test at a 95% confidence...

Extracted text: The historical Average rainfall for Albany N,Y is 36.9 inches a year, with standard deviation of 4.3 inches. The average for the last 40 years has been 41.1 inches a year. Test at a 95% confidence that the yearly rain has increased. (Assume we have all the conditions for a normal model)