An environmental group conducts a study to measure energy consumption in a large metropolitan city as measured by the amount of gasoline purchased. In a random sample of 14 vehicle owners on a particular day, they calculated a mean of 13.62 gallons and a standard deviation of 3.92 gallons. Thus, the standard error of the sample mean is gallons. (Give your answer rounded to 2 decimal places.) Please type the correct answer in the following input field, and then select the submit answer button or press the enter key when finished.