Exam (elaborations)
Stats 110 Final Exam Detailed Questions And Expert Answers
- Course
- STAT 110
- Institution
- Harvard University
Stats 110 Final Exam Detailed Questions And Expert Answers
[Show more]
Content preview
Stats 110 Final Exam Detailed Questions AndExpert Answers
Individuals - ANS are the objects described by a set of data.
response - ANS variable that measures an outcome
observational study - ANS "look dont touch"
sample survey - ANS observational studies that survey some group of individuals
by studying only some of its members because they represent the larger group
population - ANS a group of ALL individuals about which we want the information
in a statistical study
sample - ANS SOME of the population from which you collect the information and
is used as conclusions about the whole
experiment - ANS deliberately imposes some treatment on individuals in order to
observe their responses
-to see if a treatment causes change in the response
biased - ANS statistical study that systematically favors certain outcomes
,convenience sampling - ANS selection of whichever individuals are easiest to reach
-biased
voluntary response sample - ANS chooses itself by responding to a general appeal
-write in/call in
-biased
simple random sample - ANS all numbers are mixed up and each has equal chance
to be selected
table of random digits - ANS when numbers are 80% use 0-9
when numbers are 88% use 00-99
parameter - ANS number that describes the population
statistic - ANS number that describes the sample
sample proportion formula - ANS p-hat= x÷n
bias - ANS consistent, repeated deviation of the sample statistic from the
population parameter in the same direction when we take many samples
, variablility - ANS describes how spread out the values of the sample statistic are
when wer take many samples
good sampling has... - ANS Small bias and small variablility
reduce bias - ANS use random sampling to do what
to reduce the variablility - ANS use a larger sample
MoE for 95% confidence≅ 1÷√ⁿ - ANS margin of error is 1 divided by the total
population
95% confidence means - ANS used the sampling method that gives a result this
close to the truth 95% of the time
two parts of a confidence statement - ANS 1. margin of error- how close to the
population parameter
2. level of confidence -what percentage of all possible samples satisfy the margin
of error
confidence statements always apply to - ANS the population not the sample
Sampling errors - ANS errors caused by the act of taking a sample
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 Schoolflix. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
85443 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now