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Statistics Final
Final Exam
24
Mathematics
05/20/2013

Term
 Bar Graph
Definition
 Displays the distribution of a categorical variable.
Term
 Boxplot
Definition
 Conveys additional information (five number summary) Identifies outliers
Term
 Confident
Definition
 to describe the level of certainty in the interval estimate
Term
 Confidence Level
Definition
 the measure of how confident you are that the interval does, in fact, contain the true parameter value.
Term
 Critical Value
Definition
 is the point (or points) on the scale of the test statistic beyond which we reject the null hypothesis, and is derived from the level of significance α of the test.
Term
 Dotplot
Definition
 useful for displaying the distribution of relatively small datasets of a quantitative variable.
Term
 Emperical Estimate
Definition
 the proportion of times that the event occurs in the simulated repititions of the random process.
Term
 Emperical Rule
Definition
 applies to mound shape data sets, approx. 68% of the observations fall within 1 SD of the mean, approx. 95% fall within 2 SD of the mean, and approx. 100% fall within 3 SD of the mean.
Term
 Expected Value
Definition
 the average value by numerical random process
Term
 Five Number Summary
Definition
 minimum value, lower quartile, median, upper quartile, maximum value.
Term
 Inter Quartile Range (IQR)
Definition
 measure of variability, difference between the lower quartile and upper quartile (Q3-Q1)
Term
 Lower Quartile
Definition
 value of 25% of the values are less than 75% values
Term
 Margin-of-Error
Definition
 the half-width of a confidence interval
Term
Definition
 [image]
Term
 Probability
Definition
 proportion of a random event occuring in a random process
Term
 Probability Distribution
Definition
 listing of possible values of a numerical random sample, and probabilities for those values
Term
 Range
Definition
 difference between the maximum and minimum values
Term
 Relative Frequencies
Definition
 the long-run proportion
Term
 Sample Space
Definition
 the listing of all possible outcomes
Term
 Sampling Distribution
Definition
 a probability distribution of a statistic obtained through a large number of samples drawn from a specific population
Term
 Sampling Variability
Definition
 values of smaple statistics vary from sample to sample
Term
 Simulation
Definition
 random process to simulate the selection of something to get data (surveys, dice, computer program)
Term
 Standard Error
Definition
 SD / the square root of population
Term
 Z-Score
Definition
 Observation - Mean / SD
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