Data on land value were collected from the sale of 18 properties by a local real estate agent. We want to test Ho : u = 40, 183 versus H1 : u > 40, 183 with a = 0.05. The following estimates concentrated on the land value variable from the sampled properties: Cn = 42411.3, Sn = 189683181, n = 18, p-value =0.2508 What assumptions are necessary for any inferences derived from these estimates to be valid? The sampling distribution of the sample mean is approximately normal. None. The central limit theorem makes any assumptions unnecessary. O The test statistic is approximately normal. The sample was selected from an approximately normal population