GENERAL INSTRUCTIONS: Solve the following problems. Show your COMPLETE AND NEAT solutions, I. (13 pts) A researcher would like to know the proportion of the households that has a cable subscription, She gathered data from 90 households and found that 19 of them are cable subscribers. At a confidence level of 90 percent, determine the following: a. the sample proportion, p b. the 4 c. the confidence interval of true proportion, p d. what should be the sample size if the margin of error E is to be 5%%