Question: Farm Sizes. Ten years ago, the average acreage of farms in a certain geographic region was 65 acres. The standard deviation of the population was 7 acres. A recent study consisting of 22 farms showed that the average was 63.2 acres per farm. Test the claim, at a = 0.10, that the average has not changed by finding the P-value for the test. Assume that z has not changed and the variable is normally distributed.