Translation : According to an IT review, the average recovery period for IT purchases for medium-sized companies is 2.8 years. A random sample of fifty medium-sized companies led to the following results: Average recovery period: 3.1 years Standard deviation: 1.2 years We hypothesize the following statement: the average period for the recovery of computer purchases is longer than that specified by the computer journal. A) Specify in statistical form the hypotheses we want to test. B) Specify the decision rule, for a significance threshold of 1%. C) Perform the statistical test and indicate which hypothesis is favored at the 1% significance threshold. Explain