A random sample of size n = 7 from a normal population produced these measurements: 1.4, 3.7, 1.8, 1.8, 3.4, 2.7, 2.8. (a) Calculate the sample variance, s2. (Round your answer to five decimal places.) $2 = 0.76143 (b) Construct a 95% confidence interval for the population variance, 62. (Round your answers to three decimal places.) to (c) Test Ho: 02 = 0.8 versus Ha: 02 # 0.8 using a = 0.05. State your conclusions. State the test statistic. (Round your answer to four decimal places.) x 2 = State the rejection region. (If the test is one-tailed, enter NONE for the unused region. Round your answers to four decimal places.) x 2 > x2 <