Summary Stat 201 Test 2 Questions and Answers 2024 plus notes
3 views 0 purchase
Course
Statistics | probability
Institution
Statistics | Probability
Stat 201 Test 2 Questions and Answers 2024 plus notes
line of best fit ** Answ** doesn't mean it has to go through all points of the data, it just gets the middle!
y hat is predicted and y is the actual values on graph
- line tries to minimize errors
sample correlation ** Answ** ...
Stat 201 Test 2 Questions and Answers 2024 plus notes
line of best fit ** Answ** doesn't mean it has to go through all points of the data, it just gets
the middle!
y hat is predicted and y is the actual values on graph
- line tries to minimize errors
sample correlation ** Answ** R
sum of squared errors ** Answ** what is being minimized on line of best fit
parameter ** Answ** the true information we want to understand about the population (mu)
correlation conditions ** Answ** four!
QQ, straight enough, no outliers, plot doesn't thicken (model's predicted power should be same
throughout)
residuals (e) ** Answ** the difference between the actual value (y) and its associated
predicted value (y^) so "actual - predicted"
meaning of a negative residual ** Answ** below the predicted value
How well does any line fit the data? ** Answ** calculate all the residuals and hope it sums
to 0
slope in the regression equation ** Answ** (b-sub1): for each one unit increase in X, we
expect Y to increase/decrease by b-sub1 on average
intercept in the regression equation ** Answ** (b-sub0)- when X is equal to zero, we expect
Y to equal b-sub0 on average
, intercepts can be meaningless when.. ** Answ** x is 0 and does not make sense
the predicted value of y does not make sense
R^2 ** Answ** NOT THE SAME AS R!!!
the % of variation in Y that is EXplained by the variation in X
statistical significance ** Answ** determined by the p value, <0.05 means not random,
significant; >0.05 means random, likely by random chance and insignificant
Two events that can easily be added together are ** Answ** mutually exclusive/disjoint
independent ** Answ** knowing one thing/event will not influence the next event; wo
events that have no influence on the probability of each other
- "and" determines multiplication
disjoint ** Answ** two things/events cannot occur at the same time/together, have no
outcomes in common
- used with word "or" and can be added
trial ** Answ** each occasion upon which we observe a random phenomenon
outcome ** Answ** the value of the random phenomenon noted at each trial
event ** Answ** result of combining two outcomes
sample space ** Answ** the collection of allll possible outcomes
law of large numbers ** Answ** in the long run, the frequency of repeated independent
events gets closer and closer to a single value, referring to the trials
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 smartchoices. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
