EXERCISE 15.2: EXAMINING SME RATINGS OF THE JOINERSHIP ITEMS OBJECTIVE: To refine the draft joinership scale using information provided by SME ratings.

Use the data file “Joinership Rational Rating.sav” to do the following:

1. Compute the mean and standard deviation of each item.

2. Determine a single cut score that you believe reflects SMEs’ judgments that the item is too low in relevance to be included for further consideration.

There are no rules of thumb here—you’ll have to rely on your own judgment. However, don’t set your cut score so high that you have too few items for the remaining steps.

3. Justify your choice of a cut score in item 2. Why should items that receive a rating at the cut score or above be retained for further analysis? Why should items below this cut score be discarded from further analysis?