Suppose you are interested in conducting the statistical test of Ho : u - 238 against H1 : u > 238, and you have decided to use the following decision rule: Reject Ho if the sample mean of a random sample of 100 items is more than 244.41. Assume that the standard deviation of the population is 50. What is O, the probability of making a type-l error, by using this rule? 0.01 0.005 Oo.1 0.025 O 0.05