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A friend is tested to see whether he can tell bottled water from tap water. There are 50 trials (half with bottled water and half with tap water), and he gets 31 right. a. Determine the null hypothesis. b. Determine the alternative hypothesis. a. Choose the correct answer below. O A. p= 0.62 O B. p = 0.50 O C. p= 0.50 O D. p = 0.62 b. Choose the correct answer below. O A. p #0.62 O B. p= 0.62 O C. of p # 0.50 O D. p > 0.50