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Hypothesis Testing

Hypothesis testing question - see attachment


Solution Summary

Many new stockbrokers resist giving presentations to bankers and certain other groups. Sensing this lack of self-confidence, management arranged to have a confidence-building seminar for a sample of new stockbrokers and enlisted Career Boosters for a three-week course. Before the first session. Career Boosters measured the level of confidence of each participant. It was measured again after the three-week seminar. The before and after levels of self-confidence for the 14 in the course are shown below. Self-confidence was classified as being either negative, low, high, or very high.

Stockbroker Before Seminar After Stockbroker Before seminar After

J. Martin Negative Low F. Orphey Low Very High
Jagger Negative Negative Ford Low High
Hammer Low High Utz Negative Low
Jones Very High Low Murphy Low High
Cornwall Low High Arms Negative Low
Skeen Low High Pierre Low High
Simmer Negative High Walker Low Very High

The purpose of this study is to find whether Career Boosters was effective in raising the self-confidence of the new stockbrokers. That is, was the level of self-confidence higher after the seminar than before? Use the .05 signficance level.

a. State the null and alternate hypotheses.
b. Using the .05 level of significance, state the decision rule- either in words or in chart form.
c. Draw conclusions about the seminar offered by Career Boosters.