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AP Statistics Vocab

Subjects : statistics, ap
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. An event is this if we know what outcomes could happen - but not which particular values will happen






2. A sampling design in which the population is divided into several subpopulations - and random samples are then drawn from each stratum






3. The difference between the first and third quartiles






4. The tendency of many human subjects (often 20% or more of experiment subjects) to show a response even when administered a placebo






5. The difference between the lowest and highest values in a data set






6. Systematically recorded information - whether numbers or labels - together with its context






7. A display to help assess whether a distribution of data is approximately normal; if it is nearly straight - the data satisfy the nearly normal condition






8. A numerical measure of the direction and strength of a linear association






9. The natural tendency of randomly drawn samples to differ






10. The middle value with half of the data above and half below it






11. Gives the possible values of the variable and the frequency or relative frequency of each value






12. The experimental units assigned to a baseline treatment level - typically either the default treatment - which is well understood - or a null - placebo treatment






13. An equation of the form y-hat = b0 + b1x






14. Gives the possible values of the variable and the relative frequency of each value






15. A point that does not fit the overall pattern seen in the scatterplot






16. Done to eliminate units; values can be compared and combined even if the original variables had different units and magnitudes






17. The differences between data values and the corresponding values predicted by the regression model; ____ = observed value - predicted value






18. In a normal model - about 68% of values fall within 1 standard deviation of the mean - about 95% fall within 2 standard deviations of the mean - and about 99.7% fall within 3 standard deviations of the mean






19. These are hard to generate - but several websites offer an unlimited supply of equally likely random values






20. An arrangement of data in which each row represents a case and each column represents a variable






21. Value calculated from data to summarize aspects of the data






22. Uses adjacent bars to show the distribution of vales in a quantitative variable; each bar represents the frequency (or relative frequency) of values falling in an interval of values






23. The distribution of either variable alone in a contingency table; the counts or percentages are the totals found in the margins (last row or column) of the table






24. Bias introduced to a sample when individuals can choose on their own whether to participate in the sample






25. Any individual associated with an experiment who is not aware of how subjects have been allocated to treatment groups






26. Extreme values that don't appear to belong with the rest of the data






27. Control - randomize - replicate - block






28. Consists of the minimum and maximum - the quartiles Q1 and Q3 - and the median






29. Distributions with more than two modes






30. Distributions with two modes






31. Bias introduced to a sample when a large fraction of those sampled fails to respond






32. Summarized with the mean or the median






33. The lower of this is the value with a quarter of the data below it; the upper of this has a quarter of the data above it






34. The specific values that the experimenter chooses for a factor






35. A numerically valued attribute of a model for a population






36. Multiplying each data value by a constant multiplies both the measures of position and the measures of spread by that constant






37. Sampling schemes that combine several sampling methods






38. Any systematic failure of a sampling method to represent its population; common errors are voluntary response - undercoverage - nonresponse ____ - and response ____






39. Values of this record the results of each trial with respect to what we were interested in






40. The ____ we care about most is straight






41. A distribution is this if the two halves on either side of the center look approximately like mirror images of each other






42. Places in order the effects that many re-expressions have on the data






43. Lists the categories in a categorical variable and gives the count or percentage of observations for each category






44. Useful family of models for unimodal - symmetric distributions






45. Design Randomization occurring within blocks






46. Found by summing all the data values and dividing by the count






47. Found by substituting the x-value in the regression equation; they're the values on the fitted line






48. The parts of a distribution that typically trail off on either side; they can be characterized as long or short






49. A variable other than x and y that simultaneously affects both variables - accounting for the correlation between the two






50. Displays data that change over time







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