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19 Cards in this Set

  • Front
  • Back
Parameter
-definition-
Numerical description of a POPULATION
Statistics
-definition-
Numerical description of a SAMPLE
Representative sample
-definition-
mirrors population from which it was drawn
EPSEM
Equal probability of selcetion methods
Each member of the population has an equal probability of being selected
Probability
-definition-
Mathematical likelihood that an event will occur
To determine tthe probability of Event A OR Event B you need to...
add (+)the probability fractions together
To determine tthe probability of Event A AND Event B you need to...
multiply (*)the probabilty fractions
Odds
-definition-
Changes against an event occuring
Odds is ddetermined by...
Subtracting the numerator in the probability fraction from the denominator
(1/4)...4-1=3...3 chances in 4 of not selecting a client
Sampling distribution
-definition-
Theoretical frequency distribution of a sample statistic
Central Limit Theorem
-definition-
The sampling distribution of themeans becomes more normal with the increase in the sample size
Unibased Estimator
-definition-
Statistic that doesn't underestimate or overestimate its corresponding parameter
Consistent Estimator
-definition-
Statistic that tends to get close to the value of the parameter as the sample size increases
Efficient Estimator
-definition-
Statistic with a small standard error
Interval Estimation
-definition-
Delineate a range of values wherein the targeted population parameter is expected to fall
Confidence Interval
-definition-
A range of scores around a point estimate that says how much you are willing to risk that the parameter is in the interval
Alpha
-definition-
The risk factor
The probability of error
Most common alpha is...
.05
t-distributions
-definition-
bell-shaped, symmetrical with a mean of 0