A sample of 50 umpires from a highly polluted area was tested for decision-making accuracies. The sample of umpires had an average score of 45 for a measure of decision accuracies. In the general population of umpires, it is known that the average score for this measure is 60 with a standard deviation (of a distribution of scores) of 10. How do you compute the lower limit of a 99% confidence interval of a sample population of umpires from a highly polluted area? -2.58(M) + 45 +2.58(M) + 45 -2.58(M) + 60 +2.58(M) + 10