Suppose that a survey is given by a consumer interest research group to 6 customers. The group would like to know if there is a difference in the population preference for Coke vs. Pepsi. Each customer is asked if they prefer Coke or Pepsi. The sample results are expressed by recording +1 for each consumer who prefers Coke and -1 for each consumer who prefers Pepsi. The data are given below. Calculate the test statistic associated with the appropriate hypothesis test. Enter your exact value (no rounding required). ts 11 with Data: +1,-1,-1,-1,-1,-1