The health of the bear population in Yellowstone National Park is monitored through periodic measurements taken from the anesthetized bears. A sample of 54 bears has mean weight of 182.9 lb. Suppose that the population standard deviation is known to be 121.8 lb, employ a 0.05 significance level to test the claim that population mean of all such bear weights is greater than 150 lb.
Determine the value of the test statistic? Is it a t-statistic or a z-statistic?