Step by step and clear please

(b) The manager of a University campus bookshop conducts a survey to investigate whether there are any differences between undergraduate students and post-graduate students with respect to their consideration of the purchase of educational videotapes. Depending on the results, her goal is to develop relevant promotional material that will lead to increased sales in educational videotapes over the coming semester. Of the 45 undergraduate students in the survey, 27 stated that they would consider purchasing educational videotapes. Of the 60 post-graduate students, 21 said that they would consider purchasing the tapes. What proportion, p1, of undergraduate students would consider purchasing educational videotapes? li. What proportion, p2, of post-graduate students would consider purchasing educational videotapes? ii. Using your values calculated in parts i. and ii. above, construct a 95% confidence interval for the true difference between the proportion of undergraduate students and post- graduate students who would consider purchasing the tapes