Dylan Erickson
1.
An Independent Groups T-test was conducted to find a significant difference between the
satisfaction of public school teachers and private school teachers. Results show that there was a
significant difference between the two variables, t
Central Tendency and Variability
Central
Chapter 2
Outline
What is central tendency?
Classic measures
Mean, Median, Mode
Whats an average? When do we use what?
Measures of Central Tendency
While distributions provide an overall picture
of some data set,
Independent t test
Example 2
Independent t: Example 2
In a study on expressive writing, 20
students were recruited to take part. The
10 students who were assigned to the
expressive writing group wrote about their
feelings of their most traumatic life eve
One Sample t (Example 2)
Example 2
Your college newspaper reports an
informal survey showing that students at
your college study an average of 17 hours
per week.
You think that students in your dorm study
more.
You pick 16 students and ask them how
muc
Part I: Single Sample t-Tests
Chapter 7 Part a
t Test for a Single Sample
Compare a sample mean to a population
with a known mean but an unknown
variance
Similar to z-test
the variance of the population must be
estimated
Example:
Suppose a candidate r
Dependent t-test (Example 2)
Dependent Means t - test
Five people are tested on a memory test
before and after they took the memory
pills. Scores are recorded for the
numbers of correct answers they made
on the test. Investigate if there is a
change in t
Chapter04
Hypothesis Testing
What is a hypothesis?
A prediction intended to be tested in a research study
Hypotheses can be derived based on:
Observation, related results of previous studies, theory (set
of principles that attempt to explain an important
Chapter 13
Chi - Squared Statistic
Chi-Square Tests
Hypothesis testing procedures for nominal
variables (whose values are categories)
Focus on the number of people in
different categories
Chi-Square Tests
Chi-Square
Remember: Nominal or Categorical
Variab
Displaying the Order in a Group
of Numbers Using Tables and
Graphs
Graphs
Chapter 1
Defining Statistics
Branch of mathematics that focuses on
the organization, analysis, and
interpretation of a group of numbers.
Two branches of statistical methods:
Des
Testing Means
Chapter 5 (Part II)
SamplingDistribution
Topics we discussed limited to
distributions of individual scores
The sample consists of a single
score from the population (N = 1)
z-score for a person indicates
distance from the average
Researc
Example 3
ONE-SAMPLE Z-TEST
A government-sponsored telephone counseling
service for adolescents tested whether the
length of calls would be affected by a special
telephone system that had a better sound
quality.
Over the past several years, the length of
Testing Means
Chapter 5
SamplingDistribution
Topics we discussed limited to
distributions of individual scores
The sample consists of a single
score from the population (N = 1)
z-score for a person indicates
distance from the average
Research uses muc
Correlation
Correlation
Chapter 11
Correlation
Correlation
Correlation research describes the
Correlation
relationship between 2 variables
variables
Bivariate
correlation
Specifically, a linear relationship
Usually quantitative (ordinal, interval, or