Which of the following experiments uses independent samples? You want to compare

Question

Which of the following experiments uses independent samples? You want to compare the mean first-month weight gain of premature babies to that of full-term babies. So you compare the mean first-month weight gain of a random sample of premature babies to the mean first-month weight gain of a random sample of full-term babies. You want to compare the mean first-month weight gain of a random sample of premature babies to the known U.S. average first-month weight gain for all newborn babies. You want to compare the depression levels of teenage girls before and after attending a weeklong camp improving self-image. So you compare the mean Hamilton depression scores of a randomly select group of girls before and after they attend a weeklong camp focused on improving self-image.

Explanation / Answer

Answer of this question is option 2) .

Note that samples are said to be indepedent if same object is not involved in both the samples.

In second senario, we are comparing mean weight of two populations .First population consist of first month premature babies & second population consist of known US newborn babies.Here same babies are not involved in both the populations & hence in samples.Hence , these two samples are independent.

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