Chapter 20
Comparing Groups
Recall from Ch14:
Sections 20.1-20.6
Let X and Y be independent random variables. Then X Y is a random variable and
Var ( X Y ) VarX VarY and SD( X Y ) VarX VarY
Comparing
STA2023
Lab 1
Name(s):
The following lab is to give you a chance to generate your own graphs and statistics using software.
Paste your graphs and statistics on this word document, use these graphs and
Simply put, learning statistics can help
us: think more clearly about data
2. In this course, we will be working with
only those questions that can be
answered by statistics
3. What three things will
STA2023 Worksheet #1
The following problems come directly from the assigned homework.
They are due on the day of the test.
If you have been keeping up with the homework all along, feel free to just tu
Chapter 19
More about Tests and Intervals
Sections 19.1-19.5
Alpha Levels (significance levels) denoted -level
An -level is a threshold for the P-value that is set before the experiment is done.
If P-
Chapter 21
Paired Samples and Blocks
Sections 21.1-21.3
Paired Data:
Data are paired when the observations are collected in pairs or the observations of one group are naturally
related to the observat
Chapter 18
Inferences about Means
Sections 18.1-18.5
Recall: CLT (for sample Means)
When a random sample is drawn from any population with mean
sample mean,
and standard deviation
, its
x , has a sam
Chapter 16
Ex
Confidence Intervals for Proportions
Sections 16.1-16.4
Ghosts
Suppose you take a random sample of 100 U.S. adults and find that 56% of your sample believes in
ghosts. What can you say a
Chapter 15
Sampling Distribution Models (sample proportions and sample means) Sections15.1-15.5
Sample proportions
Ex1
Suppose we take a random sample of 100 people and find that 10% are left-handed.
Chapter 17
Testing Hypothesis about Proportions
Sections 17.1-17.5
Example
National data in the 1960s showed that about 44% of the adult population had never smoked cigarettes. In
2008 a national heal
Chapter 5 Probability
STA2023
Section 5.1 - Probability Rules
Probability The quantitative (numerical) measure of something occurring.
There are 2 types of probability that we will examine:
Empirical