True or False? Assume a researcher recruits 150 African American and Caucasian i

Question

True or False? Assume a researcher recruits 150 African American and Caucasian individuals taking warfarin to determine if there is a difference in the mean dosage of the medication needed to cause a decrease in their INR blood test. If the mean dosage for 75 Caucasian individuals required to get their INR blood test in range is 6.1 mg with a standard deviation of 1.7 mg and the mean dosage for 75 African American individuals required to get their INR blood test in range is 4.3 mg with a standard deviation of 0.9 mg, the decision rule for a 10% level of significance would be to reject H0 if z < -1.645 or z > 1.645.

Explanation / Answer

At 10% level of significance and two tailed test, Critical z value = 1.645

Hence,

Reject Ho if z < -1.645 or z > 1.645

This statement is TRUE.

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