An inspector inspects large truckloads of potatoes to determine the proportion p in the shipment with major defects, prior to using the potatoes to make potato chips. Unless there is clear evidence that this proportion p is less than 0. 1, he will reject the shipment. He is interested in testing the hypothesis h0: p = 0. 1 versus ha: p < 0. 1. He selects an srs of 300 potatoes from the more than 5000 potatoes on the truck. Suppose that 18 of the potatoes sampled are found to have major defects. The z-statistics for this test lies in the interval:.