In a study of cell phone use and brain hemispheric dominance, an Internet survey was emailed to 5000 subjects randomly selected from an online group involved with ears. 717 surveys were returned. Use a 0.05 significance level to test the claim that the return rate is less than 15%. . What is the critical value? A. -2.33 B. -1.645 C. - 1.96 D. -1.44 . What is the test statistic and conclusion? A. -0.91; Reject Ho B. -0.91; Fail to reject Ho C. -1.31; Reject Ho D. -1.31; Fail to reject Ho