Words with different meanings
what is blindness?
refers to subjects in an experiment being unaware of which treatment they recieve.
what is mean
the average of all numbers in a set added up and divided by the amount of numbers there are
at least one (probabality)
1-none
what is natalia's favorite skew?
skewed right
difference between statistic and parameter?
statistic describes sample and parameter describes population
What does resistant mean?
a measure whose value is unaffected by presence of outliers in a distribution
what is a variable
any characteristic of a person or a thing that can be assigned a number or category.
how many words in the gettysburg address?
268
what is the difference between a boxplot and a modified boxplot
one has outliers
explanatory variable vs. response variable
ev: variable whose effect you want to study
rv: variable you suspect is affected by the other variable
what is relative risk?
the ratio of conditional proprotions netween two groups
what does sampling bias mean
the systematic tendency of a sampling method to overrepresent some parts of the popultion and underrepresent others.
whats the z score equation
z score=obs.-mean/std. dev
MIN, LQ, MEDIAN, UQ, MAX
observational study vs. experiment
os: researches passively observe and record info about observational units
experiment: has imposed treatment
TELL ME ALL THE MEASURES OF VARIABLITY
RANGE, IQR, STANDARD DEVIATION
what is expected value
the long run average value achieved by a numerical random process.
CENTRAL LIMIT THEOREM EQUATION?
square root of pi(1-pi)/n
using the emperical rule, what percent correlates to 2 standard deviations
95%
lower quartile vs. upper quartile
mean of the values under the median is lower quartile while mean of values above median is UQ
event?
subset of sample space
a good experiment has.....(5 things)
random assignment, double blindess, treatment, control, variables
What is the P(E|F)?
P(EnF)/P(F)
name all the displays of data we have encountered
bar graph, histogram, dotplot, boxplot
quantitative vs categorical but also list 3 charateristics of each
numerical characterstic vs group designation. q: can be average, dotplots to display, must be numbers c: cant be averaged, bar graphs, not numbers