A Major Company Would Like to Assess the Impact of Using

Essay

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)serve 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:
$$\begin{array} { l l } \frac { \text { Controls } } { } & \text { Workshop } \\\hline M = 17.5 & M = 22.7 \\S S = 100 & S S = 124\end{array}$$
Use the sample data to construct an 80% confidence interval for the mean difference in confidence between the control group and the workshop conditions.