Flashcards
Flashcards Statistics I&II (Theory Only!) Year 1.2/2.4 Psychology
[Show more]
Preview 3 out of 85 Flashcards
What is stratified random sampling and when is it (dis)proportional?
What is stratified random sampling and when is it (dis)proportional?
Stratified random sampling is a type of probability sampling that divides the population into separate groups, called strata, and then selects a simple random sample from each stratum. Stratified random sampling is proportional if the sampled strata proportions are the same as those in the entire population. Stratified random sampling is disproportional if the sampled strata proportions differ from the population proportions; this is used if the group is such a small part of the population that it may not have enough representation in a simple random sample to allow for precise inferences.
What is the interquartile range (IQR)?
What is the interquartile range (IQR)?
The difference between the lower and upper quartiles. The interquartile range describes the spread of the middle half of the observations. The IQR increases as the variability increases. In contrast to the ordinary range or the standard deviation, the IQR is not sensitive to outliers.
What is the central limit theorem?
What is the central limit theorem?
The central limit theorem states that with a large sample size, the sampling distribution of the sample mean is approximately a normal distribution.
Flip
Seller
Followmandyrose
Reviews received
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller mandyrose. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.21. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
49497 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now