Chapter PIII, Problem 32RE

(a)

To determine

To find: the kinds of design on the basis of provide information.

Explanation of Solution

There have details on antacids. Researchers want to compare the efficiency of antacid forms. This is a randomised and gender-blocked configuration of the experiment.

(b)

To determine

To explain: that it invalidates the results, yes or no.

Explanation of Solution

Instead of a random sample of all persons suffering from acid reflux disorders, the test uses volunteers. This does not invalidate outcomes because the studies measure reaction to therapy and do not try to evaluate uncertain parameters. In the experiment, the function of randomization is that it assigns a population to random assignment treatment groups, but not arbitrary selection.

(c)

To determine

To explain: the use of placebo can make this experiment confusing.

Explanation of Solution

The experiment tests the effects of an antacid, because the introduction of any drug, including a sugar pill in the digestive system might have an effect on acid reflux, placebo could potentially confuse the experiment. Placebo is often recommended, but it is hard to find at some point, because there is no placebo impact.