This data set contains the achievement test (English as a Second Language) results and some background data collected during experimental trial of a new ESL program. The study was one year in...

This data set contains the achievement test (English as a Second Language) results and some background data collected during experimental trial of a new ESL program. The study was one year in duration. Students were allocated to the experimental ESL program class and a regular program control class on a random basis. Vocabulary and grammar tests were administered to the students in both groups at the beginning and the end of the school year.

Variables

The dataset includes 24 cases and 7 variables:

• Student ID


• Group (1 - experimental, 2 - control, 9 - missing)


• Gender (1 - male, 2 - female, 9 - missing)


• Pre-test vocabulary scores (scores range from 0 - 25, 99 - missing)


• Pre-test grammar scores (scores range from 0 - 25, 99 - missing)


• Post-test vocabulary scores (scores range from 0 - 25, 99 - missing)


• Post-test grammar scores (scores range from 0 - 25, 99 - missing)

(a) develop a research question that can be addressed with independent-samplest test

(b) state the null and alternative hypotheses (in words)

(c) state the alpha level

(d) run the analysis

(e) provide interpretation of results (including checks for assumptions and effect size) following APA format.