7.12 Drill rig operations. In January 2021, an energy finance analysis study by the Institute for Energy Economics and Finance Analysis reported that the price volatility of lique- fied natural gas (LNG) will increase in 2021 due to delays in drilling activity for shale oil and gas in 2020. It was re- ported that, internationally, drill rig operations were down by 40% over the year 2020. a. Identify the parameter of interest. b. Give the null and alternative hypotheses for testing the reported decreased percentage of drill rig operations. c. Describe a Type I error in the words of the problem. d. Describe a Type II error in the words of the problem.