Question 8 (1 point) Researchers were interested in estimating the average water hardness in Guelph, where water hardness was measured by the calcium carbonate concentration in mg/L. If they carried out a test of Ho: H=300 against a two-sided alternative at the 5% level of significance, the p-value for this test was found to be 0.0132. Which of the following 95% confidence intervals could be a 95% confidence interval for the mean water hardness in Guelph? (217, 304) O (270, 330) (323, 412) (281, 392) O (165, 318)