【Mathematical statistics】Nonparametric hypothesis testing

multiple choice

1. Compared with parametric tests, the main characteristics of non-parametric tests are ( A ).
   A. There is no requirement for the distribution of the population
   B. It does not depend on the distribution of the population
   C. Only the location parameter of the population is considered
   D. Only the distribution of the population is considered

2. In order to increase market share, Company A and Company B carried out advertising campaigns at the same time. Before the advertising campaign, Company A had a market share of 45%, Company B had a market share of 40%, and other companies had a market share of 15%. In order to understand whether the market share of A, B and other companies changed after the advertising campaign, 200 consumers were randomly selected, of which 102 said they were going to buy company A’s products, 82 said they were going to buy company B’s products, and the other 16 said they would buy products from company B. Ready to buy products from other companies. Test whether the market share of each company has changed before and after the advertising campaign ( α = 0.05 \alpha=0.05