PSYC 354 HOMEWORK 3 Central Tendency
and
Variability
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Questions 1–7
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Questions 1-4
Fill in
the highlighted blanks to answer/complete the statements.
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The arithmetic average of a set of numbers is the mean.
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2)
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What is an
outlier?
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3)
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Which
widely-used measure describes the typical amount or distance a score
deviates from the mean in any given distribution?
3. Standard Deviation (-2)
– correction from professor
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4)
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What is the
mathematical relationship between variance and standard deviation?
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Part I: Concepts
These questions are based on the Nolan and Heinzen reading and end-of-chapter questions.
Question
5
For the following terms,
write the equivalent mathematical symbol (letter or letters) for the sample
statistic.
Question 6a-6c
These are the winning percentages for 11 baseball players for each one’s best 4-year pitching performance:
6-c ) Compare the mean and median.
Does
the
difference
between them suggest that the
data
are skewed very much?
6-a) What is the mean of the scores? (Compute this using
a calculator):
6-b) What is the median of these scores?
Explain.
Question
7
York City.
Based on this module/week’s reading, why do you
think the author of this
graph chose the
median
household income instead of the mean
household income to
describe central tendency?
Part II: SPSS Analysis
Green and Salkind Course Text, Lesson 21: Exercises 1, 4, 7, and 8
· Questions 1 and 4
o Green and Salkind Text, Lesson 21
o Lesson 21 Exercise
File
1 (located under course’s
Assignment Instructions folder)
Part II:
Exercises 1a-1d and Exercise 4
Green and
Salkind,
Lesson 21, Exercises
1 and 4
Open “Lesson
21 Exercise File 1” in order to complete these exercises.
Part III: SPSS Data Entry and Analysis
The steps will be the same
as the ones you have been practicing
in Part I of the assignment; the only
difference is that
you
are now responsible for creating the data file, as well. Remember to do
the following:
a) Name and define your variables
under the Variable View,
then return to the Data View to enter the data; and
b) Paste all SPSS output and graphs into your homework file at the appropriate place.
Part III:
Questions 1-4
The following data are
taken
from
the Bureau of Labor Statistics surveys from the years
2009–2013.
They
represent the average
weekly pay for wage
and salary earners measured at 4 different quarters each year and broken
down by gender.
……………………………………………..
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