You have used a regression model to predict that = 57.22 when x = 3.09. You would like to describe the uncertainty around the average value of y when x = 3.09. The estimated standard deviation of e is o = 37.89, the sample size is n = 53, the mean of x is a = 4.47 and Sxx = 2586.03. Which of the following statements is true? You should use a prediction interval. An 90% prediction interval is given by ( -6.9, 121.3) You should use a confidence interval. An 90% confidence interval is given by (-6.9, 121.3) You should use a confidence interval. An 90% confidence interval is given by ( 48.3, 66.1) You should use a prediction interval. An 90% prediction interval is given by ( 48.3.66.1) Question 4 1 pts