A commercial bank is concerned about its image among its clients. In a random survey that was run last year among 500 clients, 54% said that they were satisfied with the level of customer service. This year, in another survey among 400 clients, only 45% said that they were satisfied with the level of customer service.
b) At the 5% level of significance, can we infer that the level of satisfaction among the bank’s clients has decreased by more than 5 percentage points?