Questions Uploads
Which of the following r’s have the least predictive value?
a. 0.91
b. 0.5
c 0.17
d. 0.23
e -1.00
If the mean of a sample’s scores is 30 and the standard deviation is 2, it is reasonable to conclude that:
the sample’s scores are clustered tightly around the mean.
the sample has at least several outliers.
the range of scores is large.
the mean and the median are substantially different.
Experiments with an A-B-A-B design generally have ____________ than experiments with an A-B-A design.
less internal validity
greater internal validity
greater experimental mortality
less treatment fidelity
In the Carville City School District, Superintendent Porter sent an e-mail to the principal of each school
asking teachers to develop a set of performance objectives for each class they teach. Teachers were
upset, and a well-respected teacher accidently sent a negative message to her principal. The principal
does not know how to respond.
Questions:
Evaluate the e-mail communications of Mr. Porter and Mr. Weigand. To what extent are they
communicating effectively about the new performance objectives? Explain. If you were a teacher, how
would you have felt after receiving the e-mail? Why?
If you were Mr. Weigand, how would you respond to the angry teacher? Be specific about how you would
communicate with her and what you would say. How could he have communicated differently about the
performance objectives to influence the teachers more positively?
Identify the mistakes that the teacher made when composing and sending her e-mail message.
Sample Solution
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