Download presentation

Presentation is loading. Please wait.

Published byAlysa Essex Modified over 3 years ago

1
Sampling Probability Sampling Nonprobability Sampling

2
Probability Sampling Sampling element Population Target population Sampling frame Sampling ratio

3
There is a classic Jimmy Stewart movie, Magic Town, about "Grandview," a small town in the Midwest that is a perfect statistical microcosm of the United States, a place where the citizens' opinions match perfectly with Gallup polls of the entire nation. A pollster (Jimmy Stewart), secretly uses surveys from this "mathematical miracle" as a shortcut to predicting public opinion. Instead of collecting a national sample, he can more quickly and cheaply collect surveys from this single small town. The character played by Jane Wyman, a newspaper editor, finds out what is going on and publishes her discovery. As a result the national media descend upon the town, which becomes, overnight, "the public opinion capital of the U.S."

4
Probability Sampling

5
Sampling Distribution

6
Probability Sampling Random sample Sampling error Four Ways to Sample Randomly – Simple Random – Systematic – Stratified Sampling – Cluster Sampling

7
Random Sample Sampling Error: Variation Component Sample size Component

9
R Session data=c(1,1,0,0,0,0,1,1,0,1,1,0,1,1,1,0) population.mean=mean(data) #samples of size 5 a.sample=sample(x=data,size=5,replace=FALSE) a.mean=mean(a.sample) #another sample b.sample=sample(data,5,FALSE) b.mean=mean(b.sample) #Distribution of sample mean #We need to sample lots of times sim.runs=100 mean.sample=NA for (i in 1:sim.runs){ sample.data=sample(data,5,FALSE) mean.sample[i]=mean(sample.data) } hist(mean.sample,breaks=4)

10
Sampling Distribution and Sampling Error

12
Sampling and Confidence x

13
Important Concepts in Sampling Margin of Error Finite Population Correction Factor Sampling error Next: Sample size

15
Other Probability Sampling Designs

Similar presentations

Presentation is loading. Please wait....

OK

Qualitative and Quantitative Sampling

Qualitative and Quantitative Sampling

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Best ppt on forest society and colonialism in india Ppt on work and energy class 11 Ppt on collection of data Ppt on water softening techniques in motion Ppt on ready to serve beverages Ppt on channels of distribution diagram Ppt on world photography day Ppt on series and parallel circuits practice Ppt on mars one astronauts Ppt on tv engineering