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A random sample of size n = 7 from a normal population produced these measurements: 1.6, 3.5, 1.6, 2.1, 3.3, 3.0, 3.1. (a) Calculate the sample variance, s. (Round your answer to five decimal places.) S2 = (b) Construct a 95% confidence interval for the population variance, of. (Round your answers to three decimal places.) to (c) Test Ho: oz = 0.8 versus Ha: oz # 0.8 using a = 0.05. State your conclusions. State the test statistic. (Round your answer to four decimal places.) *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 D O H0: ([41 142) e 0 versus Ha: (I41 [42) = 0 H0: (u1 [42) = 0 versus Ha: (u1 \"2) at 0 O HO: ("1 [42) f 0 O Ho: ( 1 1 - 12 ) t 0 O Ho : ( 1 1 - M2 ) t