Based on the average predictions of 40 economists, the U.S. gross domestic product (GDP) will expand by 1.9% this year. Suppose the sample standard deviation of their predictions was 3%. At the 10% significance level, test if the mean forecast GDP of all economists is less than 3%. a. (2pts) Select the null and the alternative hypotheses. Hop 3: HA3 Ho-3: HA>3 Ho: -3: HA