Western University (Ontario)  Also known as University of Western Ontario
STATS
MOS 2242

Fall 2016
Lecture 6
tTests
Hypothesis Testing with tTests:
Ho: sample mean = another mean
Ha: sample mean another mean
Another x options:
1. Fixed value: comparing historic value to the value you have now (one sample)
2. Another sample: two independent groups (i.
Western University (Ontario)  Also known as University of Western Ontario
STATS
MOS 2242

Fall 2016
Exam 1 Review
1. Although research questions typically concern a_, a research study typically examines
a _.
A. Sample, population
B. Statistic, sample
C. Population, sample
D. Parameter, population
Answer: C.
2. A selection process that ensures that each
Western University (Ontario)  Also known as University of Western Ontario
STATS
MOS 2242

Fall 2016

First exam is of definitions and a few calculations
Populations and Samples Definitions:

Generalization of the population through samples
Population: a set of existing units (people, objects, or events)
Variable: a measurable characteristics of the po
Western University (Ontario)  Also known as University of Western Ontario
STATS
MOS 2242

Fall 2016
Lecture 7
Confidence Intervals


Inferential stats involve estimating what the population is like (An unknown population
stat)
Issues involve the nsize (larger n then closer to the population and greater confidence in
estimates)
Standard Error = sd/ n
Western University (Ontario)  Also known as University of Western Ontario
STATS
MOS 2242

Fall 2016
Lecture 4
Discrete Random Variables

Possible values can be counted or listed
For example:
o The number of defective units in a batch of 20 manufactured products
o A rating (on a scale of 1 to 5) in a survey
Continuous Random Variables


May assume any
Western University (Ontario)  Also known as University of Western Ontario
STATS
MOS 2242

Fall 2016
Exam 2 Review
1. A sample of n = 25 score has a mean of 11. If each score in the sample is multiplied by 6,
the new mean would be.
a. 11
b. 6
c. 66
d. 150
2. Which of the following deviation scores corresponds to the score that is farthest away
from the m
Western University (Ontario)  Also known as University of Western Ontario
STATS
MOS 2242

Fall 2016
Lecture 8
Measures of Association
Outline
1. Multinomial Probabilities (1 Independent Variables the controlled variable)
2. Contingency tables (2 or more Independent Variable)
Multinomial Probabilities
~ are the probabilities of events equal across condit
Western University (Ontario)  Also known as University of Western Ontario
STATS
MOS 2242

Winter 2015
Time Series Forecasting

Time = chronological order
Examines observations over time
Is a special type of longitudinal analyses
o Studying the same thing over time (studying the same kids growth over time)
Definitions:
 Trend = growth (upward) or decline
Western University (Ontario)  Also known as University of Western Ontario
STATS
MOS 2242

Fall 2016
Lecture 3
Distributions


Information Provided:
1. The range of scores (are the scores within a legitimate range)
2. If scores are clustered or grouped together (concerned about grouping because ex.
Testing 2 extreme groups sex, thered only be 2 cluster