Author Question: A company claims that 9 out of 10 doctors (i.e., 90%) recommend its brand of cough syrup to their ... (Read 91 times)

CORALGRILL2014 · **on:** Feb 14, 2020

Question 1

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:
◦ -2.33
◦ 2.33
◦ -1.99
◦ -1.83

Question 2

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 doctors was taken. Suppose the test statistic is z = -2.23. Can we conclude that H₀ should be rejected at the

and

level?
◦ a) no; b) no; c) yes
◦ a) yes; b) yes; c) yes
◦ a) yes; b) yes; c) no
◦ a) no; b) no; c) no

tmlewis4706 · **Reply #1 on:** Feb 14, 2020

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