Exam (elaborations)
Stat 110 - Exam Detailed Questions And Expert Answers
- Course
- STAT 110
- Institution
- Harvard University
Stat 110 - Exam Detailed Questions And Expert Answers
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Stat 110 - Exam Detailed Questions And ExpertAnswers
individuals - ANS objects described by a set of data
variable - ANS any characteristic of an individual
data - ANS actual measurements recorded for individuals
observational study - ANS observes individuals & measures variables of interest
but doesn't attempt to influence the responses - generally no cause/effect
conclusions - don't apply treatments --> strictly observational
sample survey - ANS type of observational study that surveys a group of individuals
by studying only some of its members (selected because they represent the larger
group of individuals) - individuals provide their own responses - sample survey
because the individuals participating are a sample of the population
experiment - ANS deliberately imposes some treatment on indviduals in order to
observe their responses - purpose = to study whether the treatment causes a
change in their response
census - ANS a sample survey that attempts to include the entire population as the
sample
, population - ANS entire group of individuals about which we want info
sample - ANS part of the population from which we actually collect information
and is used to draw conclusions about the whole
convenience sample - ANS selection of whichever individuals are easiest to reach -
researcher chooses who to ask to participate - individuals can still choose not to
participate
voluntary response sample - ANS chooses itself by responding to a general appeal -
individuals volunteer themselves to be in the sample
biased - ANS if a study systematically favors certain outcomes
simple random sample - ANS most basic, good sampling method - every set of
individuals has an equal chance to be the sample actually selected - every
individual has an equal chance of being chosen for the sample
parameter - ANS a number that describes the population - a fixed number
statistic - ANS a number that describes the sample - often use to estimate an
unknown parameter
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