Formula for linear models.
Prediction, extrapolation, significance test against zero
slope.
Last time, we looked the linear regression formula.
Its the line that fits the data best. The Pearson correl
 Midterm Practice Problems Today!
Practice Midterm:
Q1: Describe this distribution.
Q2: Statistic or Parameter
Q3: Probability
Describe this distribution
Use the checklist:
Center:
where is the middl

Stratified Samples
Systematic Samples
Samples can vary
Standard Error

From last time: A sample is a small collection we observe and
assume is representative of a larger sample.
Example: You havent
What is inference?
Hypothesis tests in t
This weeks lectures are actually a combination of chapter 6
and chapter 7 material.
Knowing something about a sample, on its own, isnt very
useful.
Information
Welcome to STAT203 Statistics for Social Sciences
Todays agenda:

Introduction
Policies
How to win at statistics.
Ch. 2 start: Nominal, Ordinal, and Interval data.
Video: Joy of Stats  Florence Nigh
This time: ANOVA examples, course wrapup.
ANOVA/Review example: We have a zombie outbreak. Weve
identified the cause: the nefarious Bayes Virus.
So far, we have five possible treatments were testing
Ttest in SPSS
Hypothesis tests of proportions
Confidence Intervals (End of chapter 6 material)
Definition of pvalue:
The probability of getting evidence as strong as
you did assuming that the null h
Today:
 InterQuartile Range,
 Outliers,
 Boxplots.
Reading for today: Start Chapter 4.
Quartiles and the Five Number Summary
 The five numbers are the Minimum (Q0), Lower
Quartile (Q1), Median (Q
Todays Agenda:

More examples with probability
The normal distribution
Probability and the normal distribution
Z scores
You should be about halfway through Chapter 5 by now.
(For assignment as well)

Identify the appropriate test
One proportion test
Two samples independent
Two samples paired
Estimate the correlation
Significant correlation
What test should you do? Example 1
You want to find if m
Review Pvalues
Type I and Type II Errors
Talk to your kids about pvalue, or someone else will.
pvalue: If H0 is true, what would the chances of observing as
much evidence as we did?
If the pvalue
A full analysis example
Multiple correlations
Partial correlations
New Dataset: Confidence
This is a dataset taken of the confidence scales of 41
employees some years ago using 4 facets of confidence
Midterm 2, Question 2, 3, 4.
Odds. Odds Ratio.
Fractal by Emma Taylor.
Question 2: Test the null that the mean is 40 against the
twotailed alternative.
= 46, s =6, n = 9
First, identify: We only have
STAT 203 Lecture 41.

The normal distribution is symmetric.
Getting the probability from between two zscores
Translating standard scores to and from raw scores.
Extreme values beyond the table.
So
Problem 10.19
Problem 10.21
Using correlation to see if paired
Begin Chapter 11: The regression equation.
Problem 10.19: Do reading and television viewing compete for
leisure time? We have a random sa
My friend Dave has terrible luck. He bought a computer, and
within 11 months (still under warranty) he had replaced the
bluetooth (twice),
motherboard,
heat sink, fans, and media button bar (twice),
Todays agenda:
 Frequency and Cumulative Frequency
 Modes
 Symmetry and Skew
 Mean and Median
 Which is best?
 Video: The mean
Frequency and Cumulative Frequency
 A frequency distribution, like
Todays Agenda:

More examples with probability
The normal distribution
Probability and the normal distribution
Z scores
You should be about halfway through Chapter 5 by now.
(For assignment as well)
Today: Dummy variables.
Dummy variables in a multiple regression, regression wrap up.
Looking back in regression, weve looked at how an interval
data response y changes as an interval data explanatory
Review Pvalues
Type I and Type II Errors
Talk to your kids about pvalue, or someone else will.
pvalue: If H0 is true, what would the chances of observing as
much evidence as we did?
If the pvalue
Wed, June 26, (Lecture 82). Nonlinearity.
Significance test for correlation
Rsquared, SSE, and SST.
Correlation in SPSS.
Last time, we looked at scatterplots, which show the
interaction between two
STAT 203 Lecture 41.

The normal distribution is symmetric.
Getting the probability from between two zscores
Translating standard scores to and from raw scores.
Extreme values beyond the table.
So
What is inference?
Hypothesis tests in t
This weeks lectures are actually a combination of chapter 6
and chapter 7 material.
Knowing something about a sample, on its own, isnt very
useful.
Information
Shortish example: Handedness and Career Field
Long example: Handedness and Brain Mapping
ANOVA: Jumping from 2 sample ttest to 3+ samples.
Final review session (optional for the class)
Aug 7 10amno

A few more notes about Z
SPSS and the normal curve
Chapter 6: Samples vs. Populations
Convenience/accidental sampling: why online polls suck
Last day, we looked at the relationship between standard
One more example of a hypothesis test
Chapter 10: Scatterplots
If time: Joy of Stats 200 Countries, 200 Years
You should know this.
You should be familiar with all of this, but dont waste
too much tim
This time: ANOVA examples, course wrapup.
ANOVA/Review example: We have a zombie outbreak. Weve
identified the cause: the nefarious Bayes Virus.
So far, we have five possible treatments were testing
 Midterm Practice Problems Today!
Practice Midterm:
Q1: Describe this distribution.
Q2: Statistic or Parameter
Q3: Probability
Describe this distribution
Use the checklist:
Center:
where is the middl
Today:
 Common problems from assignment 1. Q1,2,3,4.
Question 1. Consider the data set cfw_15, 9, 7, 20, 4, 12, 8, 0, 31
1f: Determine if this distribution is positively or negatively
skewed. How do
Todays Agenda Wrapping up Ch.3 and 4

Mean and frequency (Loose end Ch. 3)
Variation (Not in text)
Standard Deviation (Ch.4)
Standard Deviation and Outliers (Ch. 4)
Consider the data set cfw_0,0,0, 4
2) A flush, if we pick the suit first, we have 4C1 = 4 choices. For that suit, there are 13 cards
from which we choose 5. Thus, we have 13C5 =
# flushes = 4C1.(13C5) = 5148 = 5148 Dividing by the numb
Lab 10: Disk, Process Scheduling
Note: The exercise numbers below refer to the file LabCH14.pdf.
Exercise 1, LabCH14.pdf
3. [1 mark] . write down how many seconds it takes.
Answer : Time taken by thi
STAT 1181
Assignment  2
1. First we must write it in ascending order: 120, 123, 125, 126, 134, 139, 144, 145, 146, 160, 162, 162, 166, 167, 167, 173, 177, 192, 207, 245
a) Mean =
X
= Sum of all obser