Two random samples are drawn from normal population are given below
Can we conclude that the two samples are drawn from the same
population? Test at 5% level of significance
Answers
Step-by-step explanation:
Studies often compare two groups. For example, researchers are interested in the effect aspirin has in preventing heart attacks. Over the last few years, newspapers and magazines have reported about various aspirin studies involving two groups. Typically, one group is given aspirin and the other group is given a placebo. Then, the heart attack rate is studied over several years.
There are other situations that deal with the comparison of two groups. For example, studies compare various diet and exercise programs. Politicians compare the proportion of individuals from different income brackets who might vote for them. Students are interested in whether SAT or GRE preparatory courses really help raise their scores.
In the previous section, we explained how to conduct hypothesis tests on single means and single proportions. We will expand upon that in this section. You will compare two means or two proportions to each other. The general procedure is still the same, just expanded.