The Next Questions Are Based on the Following Information

The Next Questions Are Based On The Following Information:
The sales representative for a manufacturer of a new product claims that the product will increase output per machine by at least 29 units per hour.A line manager installs the product on 15 of the machines,and finds that the average increase was only 26 with a standard deviation of 6.2.
-The value of the test statistic is:

A) 1.240
B) 1.874
C) -1.240
D) -1.874