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H0: U equals 25 HA: U does not equal 25 Assume a sample size of 10 from a distribution that is approximately normal and for which you know only the sample standard deviation. Further assume a signicance level of .05 or 5%. Which critical value or values apply? Think carefully about which distribution (2 or t) applies here. Q a) -1.833 and +1.833 O b) 1.833 O c) -2.262 and +2262 0 d) -2.228 and +2.228 Southwire manufactures 12-2 copper wire in 100-foot rolls. A quality control person selects 36 rolls of wire with a known population standard deviation of 3.0 feet from the production process to test whether the machine is producing something other than 100-foot rolls. After measuring each of the 36 rolls in the sample, a sample mean of 102.4 was obtained. What is the calculated value of the test statistic? Round your answer to the 3rd place to the right of the decimal. Your