Question

4. A major company would like to assess the impact of using a professional trainer to conduct a confidence-building workshop with its salespeople. A sample of 16 workers is obtained. Half (n3) attend the workshop and the other half (n 8) serves as a control group. Two weeks later, each of the participants is given a questionnaire measuring the level of self-confidence. The data are as follows: Workshop Control:s M=17.5 M=22.7 SS- 100 SS- 124 Use the sample data to construct an 80% confidence interv between the control group and the workshop conditions. al for the mean difference in confidence

Answer 1

EXCEL (Mega Stat) output: Hypothesis Test: Independent Groups (t-test, unequal variance) Controls Workshop 175 22.7 22 기 mean 11.14 std. dev. 10 13 df 5.2000 difference (Controls- Workshop) 5.2927 standard error of difference -123460 confidence interval 80% lower 1.9460 confidence interval 80% upper 7.1460 margin of error The 80% confidence interval for the mean difference in confidence between the control group and the workshop conditions is (-12.3460, 1.9460).