Unit 14
Dr. Strauss
Intro
In all of our inferential statistics there have
been assumptions about the data
What happens when these assumptions
are violated?
Nonparametric statistics
Extra Credit
We learned early in the semester that means can be greatly
Unit 14
Dr. Strauss
Intro
In all of our inferential statistics there have
been assumptions about the data
What happens when these assumptions
are violated?
Nonparametric statistics
Extra Credit
We learned early in the semester that means can be greatly
Dr. Strauss
Chapter 3
Samples must be representative of the population to be
able to draw valid statistical inferences
What can go wrong with a
sample?
Selection Bias: the selection of the sample is biased in
some way
Non-response Bias: a certain segment
STAT 200
Unit 6
Dr. Strauss
Extra credit
Can you explain the formula for finding a
percentile? Where does the z score come in?
How will the normal curve be affected if the
standard deviation in the z-score is higher than
the actual mean? How wil this af
Stat 200
Stat
Unit 5
Dr.Strauss
Extra Credit
Extra
Eventhoughitisdifficulttodetermineprobabilitiesof
exactvaluesforcontinuousrandomvariablesbecause
theprobabilityissoclosetozero,isitusefulandeven
possibletoconvertacontinuousrandomvariableintoa
dicreterand
Unit 4
Unit
Stat 200
Dr. Strauss
Extra Credit Questions
A city has 300,000 people all of who are left handed, if
city
two people are drawn without replacement, the
probability is stated to be .0099997. Where does this
huge number come from? In a sample wi
Stat 200
Stat
Unit 2
Dr. Strauss
Extra Credit
Extra
If there is a strong enough correlation (a regression close to either 1
If
or -1) could you still use the regression line to predict values outside
the range of observed data?
the
Extrapolation
Extrapola
1.If in a distribution of data the mean is GREATER than the median, then typically the
distribution will be:
A) Skewed to the right
B) Skewed to the left
C) Symmetric
Feedback: Easy key to remember is that if the mean is to the right of the median then sk
Stat200
Risk
1/28/11
o measure of an undesirable outcome
o The students in the class who fail the exam to the total number of students
in the class
o Risk is a proportion
Those in the category to the total in the group
o Risk of dying for female is 154/
Stat 200 Practice Exam 2
1. Suppose z is a standard normal variable and using Table A1:
(a) What is the relative frequency of observations from z greater than -.58?
(b) What is the relative frequency of observations from z between -1.0 and 1.0?
(c) What i
1/21/11
STAT200
Unit 2
o Extrapolation
The pattern of the relationship is only valid for values within the data set.
The regression does not include the pattern of the data are beyond the
scope of the data.
o Use regression when there are two continuous
1. From a random sample of 16 students the mean weight is 158 pounds, SD is 4 pounds, what is the SE of the
sample mean?
4/sqrt(16)= 1
2. From random sample of 20 women from a women club 60% (12) stated that they wished the club would
stay open later. Th
Stat 200
Stat
Unit 2
Dr. Strauss
Extra Credit
Extra
If there is a strong enough correlation (a regression close to either 1
If
or -1) could you still use the regression line to predict values outside
the range of observed data?
the
Extrapolation
Extrapola
Week 1
Week
STAT 200
Dr. Linda Strauss
Intro to the Course
Intro
Most of the details will be covered in lab on
Most
Tuesday
Tuesday
We will use ANGEL in all labs
Our week will start on Friday in lecture
Tuesdays in lab we will do lab activities
Thurs