Variety: The Spice of Life!
Measures of Dispersion
Chapter 4
HESC 349
Fall 2016
Chapter 4 Objectives
1. To know three measures of dispersion
and when they can be used (depending
upon level of measurement).
2. To be able to calculate the three
measures of
Reliability &
Validity
HESC 349
SPRING 2015
Objectives
Know what reliability and validity are
and why they are important
Know types of validity
Know types of reliability
Reliability
Reliability is whether a test, or
whatever you use as a measurement
t
Step 3: In-class exercise #2
THAO DANG and FARAZ SHADPOUR
1.
Marital status
Freque Perce Valid Cumulat
ncy
nt Perce
ive
nt
Percent
single
married
or living
togethe
r
539
24.6
24.6
24.6
1155 52.8
52.8
77.4
divorce
Vali d or
d
separat
ed
374
17.1 17.1
94.5
CORRELATION
COEFFICIENT
HESC 349
GOALS FOR THIS WEEK
Understand the
Correlation Coefficient &
how to represent it
Understand what a Chi
Square analysis is and
when to use it
Use SPSS to compute the
correlation Coefficient
and Chi Square analysis.
We go
Step 6: Quick review on computing z scores
1. Compute the z score for a raw score of 110 with the average value of 100 and standard
deviation of 10
2. Compute the z score for a raw score of 125 with the average value of 100 and standard
deviation of 10.
3
Step 3: Practice problems
1. The average score on SAT math was 500 with standard deviation of 100. What is the
percentage of persons having SAT math scores between 500 and 650?
2. What percentage of individuals has SAT scores greater than 650 using the me
How to access SPSS
SPSS is a software package that is commonly used in the field by businesses and clinics, as well
as many private and public research institutions. It allows the user to store and organize data sets,
run varying levels of statistical ana
CALIFORNIA STATE UNIVERSITY, FULLERTON
COLLEGE OF HEALTH & HUMAN DEVELOPMENT
DEPARTMENT OF HEALTH SCIENCE
HESC 349: Measurement & Statistics in Health Science
Concepts & Calculations for Quiz 2
SPSS: Descriptive Statistics: Concepts (no calculations)
1. B
+
Significantly
Significant
CHAPTER 9
HESC 349
+
Objectives
Know
what Significance level/Statistical
significance are and why theyre important
The
importance of and difference between
Type I () and Type II errors ()
The
plan for hypothesis testing
How
HESC 349: Final Project Worksheet (10 points)
Dataset (select one):
Name:
Older Adults & FM
Student Health
Kenneth Dang
Descriptive Statistics
Nominal
Frequencies/%
Ordinal (qualitative)
Mode
Bar chart
Mean
Pie chart
Interval/Ratio
What is your independen
CALIFORNIA STATE UNIVERSITY, FULLERTON
COLLEGE OF HEALTH & HUMAN DEVELOPMENT
DEPARTMENT OF HEALTH SCIENCE
HESC 349 Spring 2015 Semester
Instructor: Jordan K. Aquino, MPH
Homework #1
Total Points Possible: 20
For each of the variables listed below, state t
Practice problems:
HESC 349- Fall 2014
1. Classify each of the measurements listed here as interval/ratio, ordinal, or
nominal.
a. Response to treatment coded as 1: no response, 2: minor improvement, 3:
major improvement, 4: complete recovery
b. Annual in
Practice problems:
HESC 349- Fall 2014
1. Classify each of the measurements listed here as interval/ratio, ordinal, or
nominal. Answers are in RED COLOR
a. Response to treatment coded as 1: no response, 2: minor improvement, 3:
major improvement, 4: compl
Planning Your Statistical
Plan for your Project
HESC 349
Sir Ronald Fisher, 1890-1962
An important hypothesis
testing person!
Note: You will not find this
information anywhere
in the book!
Objectives
To address which statistical test to use to
test your h
Concept CheckChapter 1
HESC 349
Question 1
The following statement is an example of -component of research report:
The aim of this study was survey of effects of educational
intervention based on PRECEDE Model on self care behaviors
and control in patien
Independent Samples
T-Test
HESC 349
Review
A One Sample Z-Test is used to
Compare a sample mean to the population
mean
Review
What are the 7 Steps to Follow when computing an
inferential statistic?
1.
2.
3.
4.
5.
6.
7.
State the Null and Alternative Hyp
Review- Concept check
Chapter 3
Question 1
True/False
The mean is very sensitive to extreme scores
Question 2
True/False
The mode, range, and median are examples of
measure of central tendency
Question 3
Of the set of values cfw_170, 249, 523, 543, 5
SPSS IN FOCUSHESC 349
Worksheet 1:
In BMI2000, you will find the variables BMI (that is the Body Mass Index, measured
in kilograms per square meter) and Education (measured in years). A researcher
wants to know whether BMI is to some extent determined by
PERCENTILES
HESC 349
PERCENTILE
In statistics, it is defined as a point or position on a
continuous scale of 100
Represents the fraction of the ordered scores that are
equal to or fall below a given raw score
Percentile
Percentiles are standard scores
Practice problems- Chapter 3
Week 3 Practice HESC 349
1. A group of researchers at California State University Fullerton are part of a Research team
which focuses its studies on 3rd graders. As a part of their investigation they gather information
each st
Review- Concept check
Chapter 3
Question 1
True/False
The mean is very sensitive to extreme scores
Question 2
True/False
The mode, range, and median are examples of
measure of central tendency
Question 3
Of the set of values cfw_170, 249, 523, 543, 5
REPORTING DATA
HESC 349
FREQUENCY POLYGON
A line graph of scores plotted against frequency
Formed from simple frequency distribution
A histogram may be converted to a frequency polygon by plotting the
midpoints of the bars.
Example of a frequency polyg
Homework Assignment 1
1.
W1_In general, what language do you feel most comfortable speaking at
home?
Frequency Percent Valid Percent Cumulative Percent
P.I. Language
Only
28
5.2
6.5
6.5
More P.I.
Language than
English
43
8.0
10.0
16.5
Both P.I.
Language a
Concept Check
Validity & Reliability
Question 1
Validity serves to answer which of the
following question?
A. how do I know that the test I use works
every time I use it.
B. how do I know that the test I use works on
all population.
C. how do I know t
Sample Practice
HESC 349
Quiz 1
Question 1
. Our data set consists of 32 cases. Each case
represents a different municipal police department.
These departments were randomly selected from
all the municipal police departments in the state of
Connecticut.
Review for quiz 1
HESC 349
Question 1
The choices strongly disagree, disagree,
neutral, agree, strongly agree on a survey will
generate a nominal variable.
True
False
Question 2
The length of time a person has been married
is a/an _ variable.
Nominal
CALIFORNIA STATE UNIVERSITY, FULLERTON
COLLEGE OF HEALTH & HUMAN DEVELOPMENT
DEPARTMENT OF HEALTH SCIENCE
HESC 349 Spring 2015 Semester
Instructor: Jordan K. Aquino, MPH
Homework #2
Total Points Possible: 20
1. A group of 66 men and women have enrolled in
CALIFORNIA STATE UNIVERSITY, FULLERTON
COLLEGE OF HEALTH & HUMAN DEVELOPMENT
DEPARTMENT OF HEALTH SCIENCE
HESC 349: Measurement & Statistics in Health Science
Instructor: Jordan K. Aquino, MPH
Homework #3
Total Points Possible: 20
Part 1: SPSS: Descriptiv
HESC 349
Fall 2016
Distinguish the uses of statistics for description,
inference, hypothesis testing, and prediction.
Understand the distinction between sample statistics and
population parameters.
Understand how statistics are related to the process of
c
Chapter 2
Displaying One Distribution
HESC 349, Fall 2014
Displaying One Distribution:
What Does that Mean?
How you can summarize data for one
variable in a way that is meaningful and you
can see patterns.
Example: You collect height of 20 students.
A m
Chapters 5 & 6
Describing the Shape of a Distribution
The Normal Distribution
HESC 349
FALL 2016
Review
What does standard deviation measure?
Why do we Prefer standard Deviation to
Variance?
Review
Absolute Zero is
Review
True or False: Nominal Variab
Summarizing Data
Chapter3
HESC 349, Fall 2016
Dr. Kazemi
Objectives of Chapter 3
1. To know the three measures of central
tendency and when can be used (depending
upon level of measurement).
2. To be able to calculate the three measures of
central tendenc