Serum Glutamic-Oxaloacetic Transaminase (SGOT) is an enzyme that shows elevated activity when the heart muscle is damaged. In a study of 18 patients who underwent heart surgery, serum levels of SGOT were measured 26 hours after surgery. The mean was 46.6 U/L. In a past study, o was revealed as 12.3 U/L. Assume that the population is normally distributed. a) Is there enough evidence to conclude that the population mean of serum levels of SGOT is more than 42 U/Li at the 2% significance level? Follow the steps below. Step 1. State the null and alternative hypotheses by selecting the appropriate symbol (do not include the unit): Ho : H V ? V H1 :P V ? V Step 2. Find the critical value (s): i. What value is the best criterion to decide which table (z or t) to use? |sample size ii. If you use z-table, then state the closest left cumulative area in the table to find the critical value. If you use t-table, then state 1 tail or 2 tails a value (in decimals) with the degrees of freedom. separated by a comma