tolong bantuannya

SOAL 1 (Bobot @ 20 %) The Chancellor of Tann Abeng University (TAU) wants to know what percentage of TAU students come to campus by driving their own car. For this reason, as many as 250 students were selected randomly, it turned out that there were 90 people who came to campus by driving their own car. Using a 95% confidence level, estimate the percentage interval of TAU students who come to campus by driving their own car. SOAL 2 (Bobot @ 20 %) A labor union conducted a survey of 100 workers, it was found that the average wage received per month was only Rp. 750,000 with a standard deviation of Rp. 400,000, Make an estimate of the actual UMR range in DKI Jakarta with a 90% confidence level. 50AL 3 (Bobol @ 20 %) a. Explain the meaning of Hypothesis? Hypotheses are made before the data is collected or after it is collected? b. 1 = average sales results for the group of salesmen who were trained in sales techniques. 2 = average sales results for the group of salesmen who are not trained in sales techniques. The marketing director will continue the training if the results of hypothesis testing show that the average sales results of trained salesmen are higher than those who are not trained. Is the test using a one-way or two-way test? Show me the test procedure! If one direction, Normal curve left or right