Research question: Do lactose intolerant patients who take Lactaid versus a plac

Question

Research question: Do lactose intolerant patients who take Lactaid versus a placebo pill differ in their lactose tolerance test scores A sample of 200 lactose intolerant patients was obtained. Each participant was randomly assigned to either take Lactaid or a placebo pill before drinking whole milk. Each participant then completed a lactose tolerance test which measures blood sugar after consuming lactose Which of the following procedures could be used to compare the mean blood sugar levels of participants in the two groups? Single sample proportion z test Two independent means t test Paired (dependent) means t test Two independent proportions z test

Explanation / Answer

Question 1

The correct option is two independent means t test.

Explanation : Since we want ot test the mean blood sugar levels we will use a test for means. Since there are two groups of patients (Lactaid or placebo pill) and the patients in the two groups are not related in any way, we use two independent means t test.

Question 2

The correct option is One sample mean t test.

Explanation : Since we want to test the hypothesis about the average age of students, we use a mean test. Since, there is only one sample we use One sample mean t test.

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