7. Displaying sample means and their errors Aa Aa A researcher is investigating

Question

7. Displaying sample means and their errors Aa Aa 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 assigns 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 -13.47. Group 1 consists of n1-20 second graders who did not participate in the program. Their mean reading comprehension score is M 40.6. Group 2 consists of nz 25 second graders who did participate in the program. Their mean reading comprehension score is M2-44.3 Of the plots that follow, which best represents a plot of these results? O Plot A O Plot B O Plot C O Plot D Plot A Plot B :5 35 25 20 a 15 10 30 10 aroup 2 aroup 2 Group

Explanation / Answer

plot A is correct for it represent mean score correct

the brackkets or error bars..................extend one standard error abvoe and below..................

.....the error bar extends 13.47/20 =3.01 units above or below

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