Statistics Notes- 8/22/12
1-4 Reason for bad data- not representative
Voluntary Response
Call in radio- people only give extreme opinions if they are going to do the
work to call the radio station in the first place
Causation vs Correlation
Correlation- t
Statistics Notes- 8-20
Vocab
Data- any collection of stuff collections of observations
Population vs Sample
This Class TCU Texas
*Each group is a population, everything
below Texas is a sample i.e. TCU is a
sample group of Texas
Parameter vs Statistic
*Pa
Stats Lecture 8/29 1-5 Continued
Random sample- every individual has the same chance of being chosen- pulling
someone off the street - IDEAL- always representative
SRS- every group has the same chance of being chosen- like pulling names out of a
hat
Syste
Statistics 95 3-3
Vocab- from 3.2
Mean- population mean M- (mew)
Sample mean (x-bar)
We use mean because we dont know if we are talking about a sample mean or
population mean- thats why the term mean is used as opposed to average
We use mean because we ca
Stats Lecture 8/27/12
Chapter 1-5
How we gather data
Experiment vs Observational Study
Experiment- i.e. plant experiment- eliminates confounding (correlation vs
causation)- eliminates variables to find cause and effect. Plant experiment- put the
same soil
MATH 1370
Introduction to Biomedical Statistics
Instructor: Mrs. Cathy Lockwood
Office Location/Phone: LDB 428936-2943232
Spring 2017
Email: [email protected] or [email protected]
Office Hours: TTH 9-11 am and All others
by appointment.
Class Location: AB4 20
Problem set #7
1. Suppose that the following equations describe the money market: Md/P=0.8Y-16r Ms/P=800 Y=1100 a) Draw the money demand and money supply curves in a simple graph. b) Find the equilibrium interest rate by setting Ms/P=Md/P and solvin
Review chapter 11 answers 1. d 2. b 3. d 4. e should be a with 1 =0 and not 0 5. False .correlation does not mean causation. 6. b 7. b 8. b 9. d t critical value( = 0.05 , df ;n-2 =68) = 2 . 2.53>2 10. a ( two variables: qualitative and quantitative
Review chapter 10 answers 1. a) Reject H(0) at the .05 level Completed ANOVA table: Source -Between Within Total SS df MS -30.5 4 7.625 134.5 95 1.416 165.0 99
F test statistic = 7.625 / 1.416 = 5.385 F =0.05, df =4, 95 = 2.45 Decision rule: reject