Can you help me through this chunk of homework? Really stuck on these two problems

36. Ads A company is willing to renew its advertising contract with a local radio station only if the station can prove that more than 20% of the residents of the city have heard the ad and recognize the company's product . The radio station conducts a random phone survey of 400 people. a ) What are the hypotheses ?" b ) The station plans to conduct this test using a 10% level of significance , but the company wants the significance level lowered to 5% . Why ? C ) What is meant by the power of this test ? $) For which level of significance will the power of this test be higher ? Why ? @ ) They finally agree to use a = 0. 05 , but the company pro- poses that the station call 600 people instead of the 400 initially proposed . Will that make the risk of Type II error* higher or lower ? Explain .* 38 . Testing the ads The company in Exercise 36 contacts 600 people selected at random , and only 133 remember the ad . a ) Should the company renew the contract ? Support your* recommendation with an appropriate test . b) Explain what your P- value means in this context