Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Stats 13 vocab

States vocabulary

QuestionAnswer
Observational study a study based on data with no manipulation used
retrospective study subjects are selected and than their previous conditions or behaviors are determined. Not based on random sampling Focus on estimating differences between groups or associations between variables
prospective study subjects are followed to observe future outcomes. No treatment are applied. Not an experiment. Focus on estimating differences among groups during the study
experiment manipulates factor levels to create treatments, randomly assigns subjects to these treatments levels. Compares the responses of subject groups across treatments levels.
random assignment an experiment must assign experimental units to treatment groups at random.
factor a variable whose levels are controlled by the experimenter.
response a variable whose values are compared across different treatments.
experimental units individuals on whom an experiment is performed. Can be called subjects or participants
level the specific values that the experimenter chooses for a factor
treatment the process, intervention, or other controlled circumstance applied to randomly assigned experimental units. the Explanatory variable
Principles of experimental design Control, Randomize, Replicate, Block
Control make conditions as similar as possible for all treatment groups.
Randomize equalize the effects of unkown or uncontrollable source of variation
Replicate over as many subjects as possible. Results from a single subject are just anecdotes.
Block the only difference in the control group and the experimental group is the 1 thing we are testing.
statistically significant when an observed difference is too lrge for us to believe that it is likely to have occured naturally.
control group the experimental units assigned to a baseline treatment level.
Blinding don't let the patient know if they are in the control group or the experimental group.
single-blind, double blind these are two main classes of individuals who can affect the outcome of an experiment: those who could influence the results (subjects, technicians). Those who evaluate the results (juges, physicians)
placebo effect people think they feel differently just because they know they are being tested
2 ways to replicate use several subjects, or replicate the entire experiment on another group
extraneous factors factors that are not being experimented with but may be influencing the outcome. Eliminate this by blocking.
confounded variables factors that can't be distinguished between which one is affecting the outcome.
placebo a treatment known to have no effect.
match reduces unwanted variation
2 types of designs completely randomized design, and randomized block design
completely randomized design all experimental units have an equal chance of receiving any treatment
randomized block design the randomization occurs only within blocks
Created by: Tiffastic
Popular Math sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards