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Suppose a geriatric social worker assesses whether a life history review intervention improves the level of depression among frail nursing home residents by administering a depression measure to them before and after the intervention. Suppose the measure had its validity assess by comparing scores of frail nursing home residents on it to the scores of healthy elderly folks living independently.
Instructions:
a. What type and (subtype) of validity was assessed?
b. Why should the social worker be concerned about the measure's sensitivity?
c. What more would be needed to establish the measure's construct validity?
d. If the measure is valid, can we assume it is also reliable? Why?
Define a relation in A as follows: If (m1, n1) and (m2, n2) are elements in A, then (m1, n1) if m1,n2 = n1,m2. Show that is an equivalence relation and describe its equivalence classes.
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(a) What is the distribution of the random variable X - Y? (b) Find the probability that a given calculation will run faster using Fortran
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Suppose we had generated 100 confidence intervals. What do you think would happen to the percent of confidence intervals that contained the population mean?
Given the method of selection, would there be any other plausible explanation for the differences in computer skills among the three groups in this study?
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