An educator believes that new directed reading activities in the classroom will

Question

An educator believes that new directed reading activities in the classroom will help elementary school pupils improve some aspects of their reading ability. She arranges for a third-grade class of 21 students to take part in these activities for an eight-week period. A control classroom of 23 third-graders follows the same curriculum without the activities. At the end of the eight weeks, all students are given a Degree of Reading Power (DRP) test, which measures the aspects of reading ability that the treatment is designed to improve.

Using software, the degrees of freedom are 37.9 and the 95% confidence interval for the true difference (treatment - control) in average scores for the two groups is (1.2, 18.7)

Based on this confidence interval, we can conclude the results of a two tailed significance test for the difference between the means would not be significant at the 0.05 level.

This confidence interval is not evidence that the new directed reading activities in the classroom improve the average DRP test score.

This confidence interval is evidence that the new directed reading activities in the classroom improve the average DRP test score.

It is not possible to draw any conclusions regarding average DRP test scores from a confidence interval.

Group n x-bar s Treatment 21 51.48 11.01 Control 23 41.52 17.15 QUESTION 17 n educator believes that new directed reading activities in the classroom will help elementary school pupils mprove some aspects of their reading ability. She arranges for a third-grade class of 21 students to take part in hese activities for an eight-week period. A control classroom of 23 third-graders follows the same curriculum vithout the activities. At the end of the eight weeks, all students are given a Degree of Reading Power (DRP) test, vhich measures the aspects of reading ability that the treatment is designed to improve Grou Treatment Control 21 23 ar 51.48 41.52 11.01 17.15 Using software, the degrees of freedom are 37.9 and the 95% confidence interval for the true difference (treatment ontrol) in average scores for the two groups is (1.2, 18.7) O A. Based on this confidence interval, we can conclude the results of a two tailed significance test for the difference between the means would not be significant at the 0.05 level average DRP test score average DRP test score O B. This confidence interval is not evidence that the new directed reading activities in the classroom improve the O C. This confidence interval is evidence that the new directed reading activities in the classroom improve the D. It is not possible to draw any conclusions regarding average DRP test scores from a confidence interval.

Explanation / Answer

As the whole confidence interval lies above the value 0, therefore the confidence interval here gives significant evidence that the new directed reading activities in the classroom improve the average DRP score. Therefore C is the correct answer here. ( based on 95% confidence or 5% level of significance. )

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