5. For a study of adolescents' disclosure of their dating and romantic relationships, a sample of 231 high school students was surveyed. One of the variables of interest was the level of disclosure to an adolescent's mother (measured on a 5-point scale, where 1 = "never tall" and 5 ="always tell"). The sampled high school students had a mean disclosure score of 3.21 and a standard deviation of 1.13. The researchers hypothesize that the true mean disclosure score of all adolescents will exceed 3. Do you believe the researchers? Conduct a formal test of hypothesis using a = 0.10. Set up He and He for testing whether the true mean disclosure score of all adolescents exceeds 3. Choose the correct answer below. OA Hip=3 OB. Hill=3 O C. Ho: 1=3 OD. Ho: H#3 Ha: [1 23 If a = 0.10, find the rejection region for the test. Choose the correct answer below. O A 2>1.645 OB. 21.645 orz 1.28 O E. 21.28 orz