stats unit 6 Flashcards
Exploration
Informal, open ended examination of data for patterns
Disjoint (Mutually Exclusive)
can’t happen at the same time
Sample Space:
complete list of disjoint (mutually exclusive) outcomes
Outcome:
result of a single trial
Probability Distribution:
Gives all possible values resulting from a random process and gives the probability of each.
Law of Large Numbers:
In a random sampling, the larger the sampling the closer the Emprical probability come to the classical probability
Fundamental Principle of Counting (Tree Diagram or Two-Way Table):
if there are n1 outcomes for stage 1 and n2 outcomes for stage 2 then the possible number of outcomes for the 2 stages is n1n2
Or
one or the other or both
False positive
when a test result says that the person tested has the disease, but they actually don’t
False negative
when a test result says that the person tested does not have the disease, but they actually do
Sensitivity
the ability of a test to correctly identify people with a disease
Specificity
the ability of a test to correctly identify people without a disease
Independent Events
2 things can occur and they don’t affect each other
cases
subjects of statistical examination
variable
the characteristics of of the cases
summary statistic
condensing” data into a single number to help with data analysis
simulation
a procedure in which you set up a model of a chance process that copies a real situation.
Standard Deviation
The horizontal distance from the line of symmetry to the inflection point
skewed left/right
left: mean is pulled towards the left of the median
right: mean is pulled towards the right of the median
median
the value that divides data equally
quartiles
three numbers that divide data into quarters
interquartile range
distance between Q1 and Q3
percentile
value that separates the lowest percent
recentering
adding or subtract x to all values
