Asample of 100 mortgages approved during the current year showed that 31 were issued to a single-earner family orindivdual. the historical percentage is 25 percent (a) at the .05 level of significance in a right-tailed test, has thepercentage of single-earner or individual mortgages risen? include a sketch of your decision rule and show all work (b) isthis a close decision? (c) state any assumptions that are required.