When estimating a multiple linear regression model based on 30 observations, the following results were obtained. (You may find it useful to reference the t table.) Coefficients Standard Error t Stat p-value Intercept 152.74 127.74 1.196 0.242 x1 12.11 2.10 5.767 0.000 x2 2.07 2.51 0.825 0.416 What is the 95% confidence interval for 2? (Negative values should be indicated by a minus sign. Round final answers to 2 decimal places.) b-2. Using this confidence interval, is x2 significant in explaining y? multiple choice 3 No, since the interval does not contain zero. No, since the interval contains zero. Yes, since the interval does not contain zero. Yes, since the interval contains zero. c-1. At the 5% significance level, choose the hypotheses to determine if 1 is less than 20. multiple choice 4 H0: 1 20; HA: 1 > 20 H0: 1 = 20; HA: 1 20 H0: 1 20; HA: 1 < 20 c-2. Calculate the value of the test statistic. (Negative value should be indicated by a minus sign. Round your answer to 3 decimal places.) c-3. At the 5% significance level, can you conclude that 1 is less than 20? multiple choice 5 Yes, since the null hypothesis is rejected. Yes, since the null hypothesis is not rejected. No, since the null hypothesis is not rejected. No, since the null hypothesis is rejected