2. You would like to check if the average wage of Danish men and women is the same. In order to do that, you obtain a sample of 100 men and 50 women from Denmark. Explain how you would conduct this test under the following assumption: 1. The two populations have the same variance 2. The two populations different variances

9 Below are the results of two polls of random samples of high school seniors and juniors, who were asked if they approve of, disapprove of, or do not care about a proposed ban of energy drinks on high school campuses. Poll I Poll II Approve Disapprove Do Not Care Total Seniors 10 30 60 100 a. Compare the proportions of seniors and juniors who approve, disapprove, and do not care in the two polls. EDIT CALC TESTS Interval.... 8: Interval.... 9:2 amPZInt.... 8:2-9PTInt..... A: 1-Pro B: 2-Prop nt...... DUX2-Test..... Int...... Juniors 12 32 56 100 For each poll, use your calculator or computer software to compute a tablof expected counts and x². 554 File Data Edit Craph Sta DOUAX De HVIS MITANTS D 5 4 7 te 24 Aprove ALDRIVE De Care Toul E Serc 40 :50 Date A Approve Disapprove Do Not Care Total Regression Linear Quadratic Cubic Quartic Power tom Tools Help Test domizat Distribution stribution of male... Exponential Logarithmic Seniors Juniors 100 120 300 320 600 560 1,000 1,000 Polynomial…

A SAMPLE SIZE OF 36 WAS DRAWN AND ITS MEAN WAS FOUND TO BE 80. TEST WHETHER THIS SAMPLE COULD HAVE COME FROM A NORMAL POPULATION WITH MEAN 90 AND VARIANCE 225? Your answer

A marketing agency wanted to determine if a new commercial changed people's opinion about a company. They recruited n=30 participants to watch the commercial. First, everyone was givien a survey to determine their attitudes toward the company. Then, everyone watched the new commercial. Finally, they were given the same survey again and asked about their attitudes toward the comapny after seeing the commercial. The agency wanted to see if attitudes were changed by the commercial. What statistical test should they use?