November 9, 2012
A wave with a period T = 8s and a height H = 5.5m are propagating in a water
of constant depth h = 15m.
1. Is this wave a long wave ( shallow water wave) or a short wav
Part 1: Probability and statistics
Random sample vs Biased Sample
Descriptive Graphical Methods:
(1)Dot Diag, (2) Freq/Hist Diag, (3) Box & Whisker plot
Descriptive Numerical Methods:
Mean, Median (mid(Odd) or mid
STAT5304 Fall 2015 Project
The data set GlobalPoverty.xls contains 97 observations (nations) on 8 variables used for assessing
differences in poverty levels among the 97 nations and the 6 regions into which the nations are divid
HYPOTHESIS TESTING and CI CALCULATOR
Ho = 2
Tail (L,R.2) L
Standar Error 0.636396
Test Statistic -1.414214
1 Sided Hypothesis Testing
1 Sided 1 Sample T Test
We would like to test the claim that In order to test this claim we assume = 4 and then
assess whether the data is consistent with this assumption or not.
So now lets test this as
How about some unemployment numbers?!
1 Sample T Test
H0: = 700
x = 660.3
s = 95.9
t = 2.110
P-value: .09703 > .05
t = -1.76
Fail to Reject H0
2 SAMPLE CONFIDENCE
IF WE KNOW
Formula for a 2 Sample Confidence Interval
If = .05
We are 95% confident that the difference in diffe
1 Sample Z and T Test
We would like to test the claim that In order to test this claim we assume = 3.5 and
then assess whether the data is consistent with this assumption or not.
So now lets test this assumption
CORRELATION AND REGRESSION
Department of Statistics
STAT2331: Introduction to Statistical
STAT2331: Introduction to Statistical Methods
Review of Last Lecture
How to construct a scatterplot
1) The analysis should proceed by applying a two tailed t test, to test for the possibility of a
relationship in both directions.
The TTEST Procedure
3. Histogram for Qualifying Income for Median Single Family Home
Qualifying Income ($1000's) for Median Single Family Home Prices
10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0
Which data set would have the
greatest standard deviation?
Dice: Individual Rolls (n = 1)
Lab 3: Data Manipulation and Normal Distribution!
In this lab we will learn how to manipulate (sort, filter, etc) large data sets with Excel. In addition, we will
learn how to quickly estimate probabilities with the database itself and with the norm.dist
Business Stat 2301!
Please go to your app store and download the "Poll
Everywhere" app (it's Free!). Then open the app
and in the "Join a presentation" text box replace
"username" with "bivinsadler622. In the box it
should now read "PollEv.com/
The value at the center or
middle of a data set
denotes the addition of a set of values
is the variable usually used to represent the individual
represents the number of values in
Summarizing and Graphing
Frequency Distribution (or Frequency
lists data values (either individually
or by groups of intervals), along with
A Great Day For Stats!
Fun Fact: How many times does the average human eye blink in a year?
The human eye blinks an average of 4,200,000 times a year.
Analysis of SMU Bathroom Cleanliness
1 = Totally Disgusting 5 = Adequate 10 = Pris
This is code for drawing/shading the standard normal density
To plot the density, alter the line:
IF x <= 1.645 THEN upper = density;
- Suppose we wanted to draw/shade P(Z < 1), we would write
IF x <= 1 THEN upper = density;
- Suppose we want
8.2 Estimating Population
Learn to estimate population means and
compute the associated margins of error and
Review: Central Limit
Suppose we take many random
samples of size n for a variable with
HW 1: Due August 30, 2016 at 3:30 pm
CONFIDENCE INTERVALS AND HYPOTHESIS TESTING
Show all work for all problems! Lets get good at this!
2. Now assume that the study was based on 800 students instead of 80? Do you think the
interval should get wider or