A researcher is studying the happiness of college students. On a happiness scale that ranges from 0 to 100, they want to test if the population mean happiness rating is different from 70 (Le, the null hypothesis is p, = 70 and the alternative hypothesis is p. # 70). To do this, they collect a sample of 250 students from UCLA and measure their happiness levels. They nd a sample mean happiness level of 65, and they estimate the standard error of the mean to be 5. What would the t-statistic be for this study? -15.81 Question 2 1 pts The p-value for the happiness study described in the previous question was .318 (the null hypothesis is [.L = 70 and the alternative hypothesis is [1, 7E 70). If the researcher had instead wanted to test if the population mean happiness rating was less than 70 (Le, the alternative hypothesis is [.L