A Wine Magazine Wants to Know If Chefs Can Tell

Multiple Choice

A wine magazine wants to know if chefs can tell the difference between duck liver pâté and wet dog food. Eighteen chefs were asked to rate both the pâté and dog food on a scale from 1 to 5, with 1 corresponding to "inedible" and 5 to "very tasty." The results are shown in the following table. Assuming the sampling distribution of can be approximated by the standard normal distribution, the value of the test statistic is ________.

A) 3.767
B) -3.767
C) 0
D) None of these choices is correct.