The Weights of Soy Patties Sold by Veggie Burgers Delight

The weights of soy patties sold by Veggie Burgers Delight are normally
Distributed. A random sample of 15 patties yields a mean weight of 3.8 ounces with a
Sample standard deviation of 0.5 ounces. At the .05 level of significance, perform a
Hypothesis test to see if the true mean weight is less than 4 ounces.
The correct calculated value of the test statistic is

A) -0.4
B) 0.4
C) -1.55
D) 1.55
E) 2.79