An energy official claims that the oil output in the U.S. ha…
An energy official claims that the oil output in the U.S. has climbed from the 2014 level of 8.6 million barrels per day. He randomly selects samples 50 wells throughout the U.S. and determines the mean output to be 9.2 million barrels per day with the standard deviation of 1.3 million barrels. Test the researcher’s claim using the P-value approach at a 5% level of significance.