A company claims that 9 out of 10 doctors (i.e., 90%) recommend its brand of cough syrup to their patients.

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 proportion is less than 90%, a random sample of 100 doctors was chosen which resulted in 83 who indicate that they recommend this cough syrup. The test statistic in this problem is approximately: Choose one answer. a. -2.33 b. 2.33 c. -1.83 d. -1.99