I got 17 right, but 18 wrong. I just need the 18 answer and the reason. An educa

Question

I got 17 right, but 18 wrong. I just need the 18 answer and the reason.
An educator believes that new directed reading activities in the classroom will help elementary school pupils improve some of their reading ability. She arranges for a third-grade class of 21 students take part in these new for an period. A control classroom of 21 students follows the old curriculum without the new activities. the end of the students are given a reading test, which measures the aspects of reading ability that the treatment designed to improve. The data is summarized in the table below. The educator wants to test the hypothesis that the treatment group has better reading ability than the control group. Group 1 (treatment Ini 21 Mi 53.48 Group 2 (contro nz- 21 M2 40.52 sz 17.15 17. What i s problem? A. 6.14 B. 2.47 C. 5.30 D. 1.13 4.44 18. If the educator runs a one-tail test with a what will she conclude? (HINT: Run an independent t-test using the SEdthat you calculated for the previous question) A. She will reject Ho, and conclude that the treatment group out-performed the control group. B. She will fail to reject Ho, and conclude that the treatment group one was not different from the control group c. She will fail to reject Ho, and conclude that the control group out-performed the D. treatment group treatment She will reject Ho and conclude that the control group out-performed the group E. None of the above

Explanation / Answer

here

hence std error =(S12/n1+ S22/n2)1/2=4.44

hence option E is correct

18) test stat =(X1-X2)/std error =2.91 whcih is in critical region

option A is correct

Sp S1 11.010 S2 17.150 n1 21 n2 21 X1 53.480 X2 40.520

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