Search results “Statistics determining sample size”

Determining sample size based on confidence level and margin of error.
View more lessons or practice this subject at http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-z-interval-proportion/v/determining-sample-size-based-on-confidence-and-margin-of-error?utm_source=youtube&utm_medium=desc&utm_campaign=apstatistics
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Views: 74362
Khan Academy

The sample size is an important feature of any empirical study in which the goal is to make inferences about a population from a sample.
In this video I have discussed a very simple way to determine the Sample size with reference.

Views: 61579
My Easy Statistics

A video on how to calculate the sample size. Includes discussion on how the standard deviation impacts sample size too.
Like us on: http://www.facebook.com/PartyMoreStudyLess
Related Video
How to calculate Samples Size Proportions
http://youtu.be/LGFqxJdk20o

Views: 297602
statisticsfun

I find the sample size required to obtain a given margin of error in a confidence interval for mu. I discuss the appropriate formula and work through an example.

Views: 43814
jbstatistics

In this tutorial I show the relationship between sample size and margin of error. I calculate the margin of error and confidence interval using three different sample sizes. As the sample size increases the margin of error goes down.
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Related Videos on Sample Size:
Sample Size http://youtu.be/Z2dKK1xicgs
Sample Size of a Proportion http://youtu.be/LGFqxJdk20o

Views: 127318
statisticsfun

If you are interested in practice AP questions to help prepare you for the AP test in May please utilize Barron’s AP Statistics Question Bank. Access via the web or by downloading the app in iTunes or the Google Play Store. Links are below:
Web: https://www.examiam.com/ap
iTunes: https://itunes.apple.com/us/app/barrons-ap-statistics/id1438469502?mt=8
Google Play Store: https://play.google.com/store/apps/details?id=com.examiam.apstatistics

Views: 37959
Michael Porinchak

Link to sample size calculator: http://www.nss.gov.au/nss/home.nsf/pages/Sample+size+calculator
Link to table for 95% confidence interval (scroll to the bottom for the table):
http://edis.ifas.ufl.edu/pd006

Views: 54571
Stephanie Glen

How to calculate a sample size for a proportion (percentage). Includes discussion on how sample changes as proportions (percentages) change.
Calculating Sample Size
https://youtu.be/i47gaNmEUM0
Calculating z scores
https://www.youtube.com/playlist?list=PL6157D8E20C151497
Facebook
http://www.Facebook.Com/PartyMoreStudyLess
Professor of the Universe: David Longstreet
http://www.linkedin.com/in/davidlongstreet/
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Views: 23580
statisticsfun

How to determine the minimum sample size
1st when the population size is large
𝒏 = minimum sample size
𝒛 -value= Value of standard normal distribution
𝒑 = The expected or probability of previous similar studies
𝒅 = The maximum allowable deviation or error of the estimate
The 1st step:
Calculate the value of standard normal distribution Z-value
It can be obtained from the confidence level.
The 2nd step:
The expected rate or percentage for this phenomenon expected probability p in the population .
Otherwise it can be assumed as 50%, because this ratio always gives the biggest sample size result more conservative.
The 3rd step:
Allowable Error value or accuracy of the statistical study. That called Margin of Error MOE
No more and no less than a certain percentage e.g. + - 5%, or 2% + -

Views: 29804
MIS

Introduction to Sample Size Calculation
Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, January 2016.
************************************************
These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute.
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A spreadsheet to carry out the calculations described in the presentation may be copied here: http://datashare.is.ed.ac.uk/handle/10283/1996
*********************************************
*Recommended YouTube playback settings for the best viewing experience: 1080p HD
************************************************
Content:
Sample size calculation
Calculate it such that there is a good chance of achieving study objectives
Depends on several factors:
---Size of difference (?) to detect, minimal effect of interest
- Eg a 50% decrease in gene expression
---Significance level (a) (eg 0.05)
---Power (ß) = chance of detecting a significant result if true difference is ?
(typically 80%, 90%)
---Standard deviation (SD or s) of data (how much variability)
Basic formula for sample size - Continuous data
Where ? = size of difference, minimal effect of interest
a = significance level (eg 0.05)
ß = power, probability of detecting a significant result (typically 80%, 90%)
s = SD of data
Zp = points on normal distribution to give required power and significance
Most suitable for data assumed to be normally distributed
Non-normal continuous data :
---no ideal formula
---above formula often suitable as it tends to be conservative
(due to SDs tending to be large in non-normal data)
Z-values are from the Normal distribution

Views: 6847
The Roslin Institute - Training

This video demonstrates how to calculate the sample size with a finite population using Microsoft Excel. Variables used in the sample size equation include the confidence level, population proportion, confidence interval (margin of error) and the population size.

Views: 34151
Dr. Todd Grande

I discuss determining the minimum sample size required to achieve a given margin of error when estimating a population proportion. (For intervals based on the normal approximation.)

Views: 39706
jbstatistics

Estimating Parameters and Determining Sample Sizes Part 1
Confidence Intervals

Views: 1761
J Derosa

This tutorial shows how to determine the optimal sample size.

Views: 12713
Learn Something

Subscribe to the OpenIntroOrg channel to stay up-to-date.
This video was created by OpenIntro (openintro.org) and provides an overview of the content in Section 4.6 of OpenIntro Statistics, which is a free statistics textbook with a $10 paperback option on Amazon.
This video introduces concepts for finding an appropriate sample size when collect data.

Views: 25347
OpenIntroOrg

Video on the formula for determining sample size.

Views: 17043
Kevin Brown

Gaurang Tiwari
Faculty of Education,
Banaras Hindu University, Varanasi

Views: 2391
vmouonline

This Video covers the statistical methods used to calculate sample sizes for both attribute and variables data.
Methods for collecting the sample will be covered. Every sampling plan has risks. This webinar covers how to calculate Type I and Type II errors. A discussion of how the FDA views sampling plans, especially for validation and acceptance activities. Sample size to ensure a certain level of process capability will be covered.
For More Information Contact -
Organization: NetZealous BDA GlobalCompliancePanel
Website: http://www.globalcompliancepanel.com/
Email: [email protected]
Help us caption & translate this video!
http://amara.org/v/OXHH/

Views: 6808
GlobalCompliance Panel

statisticslectures.com - where you can find free lectures, videos, and exercises, as well as get your questions answered on our forums!

Views: 86694
statslectures

This is a lesson on how to calculate the sample size for different sampling plans with various acceptance numbers, given a particular producer's risk (alpha) and Acceptance Quality Limit (AQL)

Views: 8369
Clinton Stevenson

Download file: https://people.highline.edu/mgirvin/ExcelIsFun.htm
Topics:
1. Determine Sample size
This is for the Highline Community College Busn 210 Statistical Analysis for Business and Economics taught by Michael Girvin

Views: 30510
ExcelIsFun

This video shows how to calculate the sample size n required to estimate the population mean µ.

Views: 12360
Joshua Emmanuel

This video demonstrates how to estimate a sample size using Microsoft Excel.

Views: 36466
Dr. Todd Grande

Calculate the approximate sample size required to obtain a desired margin of error in a confidence interval for a mean.
View more lessons or practice this subject at http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/v/sample-size-for-a-given-margin-of-error-for-a-mean?utm_source=youtube&utm_medium=desc&utm_campaign=apstatistics
AP Statistics on Khan Academy: Meet one of our writers for AP¨_ Statistics, Jeff. A former high school teacher for 10 years in Kalamazoo, Michigan, Jeff taught Algebra 1, Geometry, Algebra 2, Introductory Statistics, and AP¨_ Statistics. Today he's hard at work creating new exercises and articles for AP¨_ Statistics.
Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate or volunteer today!
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Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc

Views: 10878
Khan Academy

Power and Sample Size Calculation
Motivation and Concepts of Power/Sample Calculation, Calculating Power and Sample Size Using Formula, Software, and Power Chart

Views: 12118
Kunchok Dorjee

How to calculate sample sizes for t-tests (independent and paired samples)
Download G*Power here: http://www.gpower.hhu.de/en.html
Like, Comment, and Subscribe for more content like this

Views: 6601
Design eLearning Tutorials

This video looks at the importance of sample size to understand a population. Also how a wrong size sample can give you misleading information.
People discuss that 30 is the right number, we discuss why this is the case.
Using just M&M's we can see the importance of sample size

Views: 5575
brad Cotton

Easy to understand formula to determine sample size in statistics

Views: 1341
Statistics Made Easy by JD

This lesson on inferential statistics will show you how to determine the desired or ideal sample size of a confidence interval given the confidence level.
GET BOOK: https://itunes.apple.com/us/book/power-flipped-classroom/id1048431489?ls=1&mt=11

Views: 1853
Numberbender

Views: 3211
Muhammad Ali

Constructing small sample size confidence intervals using t-distributions
Watch the next lesson: https://www.khanacademy.org/math/probability/statistics-inferential/margin-of-error/v/mean-and-variance-of-bernoulli-distribution-example?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics
Missed the previous lesson?
https://www.khanacademy.org/math/probability/statistics-inferential/confidence-intervals/v/confidence-interval-example?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics
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Views: 313975
Khan Academy

A formal wear store determines that its customer population has a minimum age of 27 years and a maximum age of 62 years. What is the minimum sample size needed to construct a 90% confidence interval for the mean age of its customers, assuming a margin of error of one year?
Questions? Tips? Comments? Like me! Subscribe!

Views: 8269
Mr. Math Expert

Estimating Parameters and Determining Sample Sizes Part 2
Confidence Intervals, t-distribution and proportion.

Views: 1254
J Derosa

Population vs sample - The first step of every statistical analysis you will perform is to determine whether the data you are dealing with is a population or a sample.
A population is the collection of all items of interest to our study and is usually denoted with an uppercase N. The numbers we’ve obtained when using a population are called parameters.
A sample is a subset of the population and is denoted with a lowercase n, and the numbers we’ve obtained when working with a sample are called statistics.
Populations are hard to define and observe. On the other hand, sampling is difficult. But samples have two big advantages. First, after you have experience, it is not that hard to recognize if a sample is representative. And, second, statistical tests are designed to work with incomplete data; thus, making a small mistake while sampling is not always a problem.
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Views: 47172
365 Data Science

Introduction on how to calculate samples sizes from proportions. Describes the relationship of sample size and proportion.
Like us on: http://www.facebook.com/PartyMoreStudyLess

Views: 27378
statisticsfun

The sample size for an experiment depends on what you want to say and what kind of replicates you have. Here I show examples of how biological and technical replicates are counted differently. I also show what to do when your samples are correlated. Oh, and just in case you're interested, the twins are monozygotic.
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Views: 11176
StatQuest with Josh Starmer

Subject:-Home science
Paper :-H16RM - Research Methodology and Statistics for Home Science

Views: 339
Vidya-mitra

Learn the basic concepts of power and sample size calculations. With definitions for alpha levels and statistical power and effect size, a brief look at Stata's interface, and strategies for increasing statistical power, this video is a useful introduction for all subsequent power and sample size videos on the Stata Youtube Channel. Created using Stata 13; new features available in Stata 14. Copyright 2011-2017 StataCorp LLC. All rights reserved.

Views: 58792
StataCorp LLC

Video providing an overview of how power is determined and how it relates to sample size.

Views: 46826
Terry Shaneyfelt

Ang statistics lesson na ito sa pag kuha ng confidence interval ng parameter ay nagpapakita kung paano magcompute ng minimum sample size na gagamitin para sa procedure ng pagcalculate ng confidence interval ng population mean.

Views: 598
Numberbender

Where does the sample size equation come from? Video shows how to derive the sample size equation from the confidence interval.
Calculating Sample Size
https://youtu.be/i47gaNmEUM0
Calculating z scores
https://www.youtube.com/playlist?list=PL6157D8E20C151497
Facebook
http://www.Facebook.Com/PartyMoreStudyLess
Professor of the Universe: David Longstreet
http://www.linkedin.com/in/davidlongstreet/
MyBookSucks.Com

Views: 6637
statisticsfun

Determining the minimum sample size needed to estimate the population mean, mu.

Views: 46624
KYStatProf

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