PSY 315 Week 3
Practice Worksheet
Complete
the University of Phoenix Material: Week 3 Practice Worksheet.
Provide a
response to the following questions.
Note: Each
team member should compute the following questions and submit to the Learning
Team forum. The team should then discuss each team member’s answers to
ascertain the correct answer for each question. Once the team has answered all
the questions, submit a finalized team worksheet.
1.
On a standard measure of hearing
ability, the mean is 300, and the standard deviation is 20. Provide the Z scores for persons whose raw scores
are 340, 310, and 260. Provide the raw scores for persons whose Z scores on this test are 2.4, 1.5, and
-4.5.
2.
Using the unit normal table, find the
proportion under the standard normal curve that lies in the tail for each of
the following:
a.
z =
1.00
b.
z =
-1.05
c.
z = 0
d.
z =
2.80
e.
z=
1.96
3.
Suppose the scores of architects on a
particular creativity test are normally distributed. Using a normal curve table
(pp. 477–480 of the text), what percentage of architects have Z scores
a.
above .10?
b.
below .10?
c.
above .20?
d.
below .20?
e.
above 1.10?
f.
below 1.10?
g.
above -.10?
h.
below -.10?
4.
A statistics instructor wants to measure
the effectiveness of his teaching skills in a class of 102 students (N = 102). He selects students by waiting
at the door to the classroom prior to his lecture and pulling aside every third
student to give him or her a questionnaire.
- Is this
sample design an example of random sampling? Explain. - Assuming
that all students attend his class that day, how many students will the
instructor select to complete his questionnaire?
5.
Suppose you were going to conduct a
survey of visitors to your campus. You want the survey to be as representative
as possible.
a.
How would you select the people to
survey?
b.
Why would that be your best method?
