Question 10 (1 point) A city planner hypothesizes that the mean age of the playground equipment in a city is 13 years old. They take a random sample of 28 playgrounds and calculate a sample mean age of 10.6 years with a corresponding sample standard deviation of 7.5 years. If they want to test their hypothesis that the mean age of the playground equipment in the city is 13 years old against a two-sided alternate hypothesis, what would be the value of the test statistic? Round your response to four (4) decimal places before entering it in the space below. Your