Psyc 354 Homework 3 Central Tendency and Variability

PSYC 354 Homework 3 Central Tendency and Variability

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PSYC 354 Homework 3 Central Tendency and Variability

Questions 1–7

Questions 1-4

Fill in the highlighted blanks to answer/complete the statements.

The arithmetic average of a set of numbers is the mean.

2) What is an outlier?

3) 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

4) What is the mathematical relationship between variance and standard deviation?

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

Recall the interactive graph from Homework 2 depicting household income and location in New

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...