Question

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 (n = 8) attend the workshop and the other half (n = 8) serves as a control group. Two week later, each of the participants is given a questionnaire measuring the level of self-confidence. Data is as follows:Control: M = 17.5, SS = 100Workshop: M = 22.7, SS = 124Does the training increase confidence? Conduct a statistical test between workshop and control group mean confidence scores are statistically significant.

Answer 1

Step 1

Use the information and formulas provided above to obtain the upper and lower bounds for the interval.

Begin by calculating the point estimate: