Civil engineers believe that the true mean number μ of vehicles per minute that turn right on a given road, during business hours, is less than 16. Thus, they want to test the hypothesis H0: μ≥16...

Civil engineers believe that the true mean number  μ of vehicles per minute that turn right on a given road, during business hours, is less than 16. Thus, they want to test the hypothesis  H0: μ≥16 against H1: μ<>

Records of 31 randomly-selected one-minute intervals have a mean of  x_(x-bar)= 16.03  vehicles per minute and a standard deviation of s=0.06 vehicles per minute. Calculate the z -score for this hypothesis test.