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1. Suppose you are working with a data set that is normally distributed with a mean of 400 and a standard deviation of 20. Determine the value of x such that only 1% of the values are greater than x. 353.4 446.6 405 400.039 Using the NORMINV function in Excel, we can the value. NORMINV(0.99,Mean,Stdev) i.e. NORMINV(0.99,400,20) = 446.6 2. When the rod shearing process at Stockton Steel is "in control" it produces rods with a mean length of 120 inches. Periodically, quality control inspectors select a random sample of 36 rods. If the mean length of sampled rods is too long or too short, the shearing process is shut down. The null hypothesis is _________. n = 36 μ = 120 μ ≠120 n ≠36 Since we want to test whether the rods are 120 inches in length or not. The null hypothesis is μ = 120, since we cannot have a NOT EQUAL to sign in the null hypothesis.