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

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

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A Company Claims That 9 Out Of 10 Doctors I E 90 Recommend Its Brand Of Cough Syrup To Their Patients To Test This 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 1 (36.85 KiB) Viewed 21 times
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 200 doctors was chosen which results in 167 who indicate that they recommend this cough syrup. Find the standardized test statistic, z. Round to two decimal places. Hint: Do not forget the sign on your answer!
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