Displaying sample means and their errors A researcher is investigating whether a

Question

Displaying sample means and their errors A researcher is investigating whether a reading intervention program improves reading comprehension for second graders. She collects a random sample of second graders and randomly each second grader to participate in the reading intervention program or not participate in the program. The researcher knows that the standard deviation of the reading comprehension scores among all second graders is e = 13.47. Group 1 consists of n_1 = 20 second graders who did not participate in the program. Their mean reading comprehension score is M_1 = 40.6. Group 2 consists of n_2 = 25 second graders who did participate in the program. Their mean reading comprehension score is M_2 = 44.3. Of the plots that follow, which best represents a lot of these results? Plot A Plot B Plot C Plot D The brackets or error bars shown at the top of each bar extend above and below each of the group means. For group 1, the error bar extends units above and below the mean for group 1

Explanation / Answer

Correct answer: Option (A) Part (A)

since Mean = 40.6 on y -axis for group 1

and Mean = 44.3 on y-axis for groups 2

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