6 Question 10 (1 point) Solve the problem. 9 A company claims that 9 out of 10 doctors (i.e., 90%) recommend its brand of cough syrup to their patients. To test this claim against the alternative that the actual 12 proportion is less than 90%, a random sample of doctors was taken. Suppose the test statistic is z = -2.23. Can we conclude that Ho should be rejected at the a) a = 10, b) a=.05, and c) a = .01 level? 15 O a) no; b) no; c) no O a) yes; b) yes; c) yes a) no; b) no; c) yes a) yes; b) yes; c) no Question 11 (1 point) Solve the