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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. A variable whose levels are controlled by the experimenter






2. Displays counts and - sometimes - percentages of individuals falling into named categories on two or more variables; categorizes the individuals on all variables at once - to reveal possible patterns in one variable that may be contingent on the cate






3. When groups of experimental units are similar - it is a good idea to gather them together into these






4. When omitting a point from the data results in a very different regression model - the point is an ____






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






6. Summarized with the standard deviation - interquartile range - and range






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






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






9. The ____ we care about most is straight






10. In a statistical display - each data value should be represented by the same amount of area






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






12. We do this by taking the logarithm - the square root - the reciprocal - or some other mathematical operation on all values in the data set






13. Displays the 5-number summary as a central box with whiskers that extend to the non-outlying data values






14. A list of individuals from whom the sample is drawn






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






16. When either those who could influence or evaluate the results is blinded






17. A variable that names categories (whether with words or numerals)






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






19. Value found by subtracting the mean and dividing by the standard deviation






20. The distribution of a variable restricting the who to consider only a smaller group of individuals






21. The most basic situation in a simulation in which something happens at random






22. Doing this is equivalent to changing its units






23. A scatterplot shows an association that is this if there is little scatter around the underlying relationship






24. A value that attempts the impossible by summarizing the entire distribution with a single number - a 'typical' value






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






26. Holds information about the same characteristic for many cases






27. To describe this aspect of a distribution - look for single vs. multiple modes - and symmetry vs. skewness






28. Variables are said to be this if the conditional distribution of one variable is the same for each category of the other






29. Consists of the individuals who are conveniently available






30. The best defense against bias - in which each individual is given a fair - random chance of selection






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






32. Distributions with more than two modes






33. An observational study in which subjects are selected and then their previous conditions or behaviors are determined






34. An event is this if we know what outcomes could happen - but not which particular values will happen






35. The natural tendency of randomly drawn samples to differ






36. 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






37. This corresponding to a z-score gives the percentage of values in a standard normal distribution found at that z-score or below






38. A sample is this if the statistics computed from it accurately reflect the corresponding population parameters






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






40. When the levels of one factor are associated with the levels of another factor so their effects cannot be separated






41. This - b0 - gives a starting value in y-units; it's the y-hat-value when x is 0






42. A hump or local high point in the shape of the distribution of a variable; the apparent locations of these can change as the scale of a histogram is changed






43. Anything in a survey design that influences response






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






45. Summarized with the mean or the median






46. The square root of the variance






47. An individual result of a component of a simulation






48. In a retrospective or prospective study Subjects who are similar in ways not under study may be ____ and then compared with each other on the variables of interest






49. A quantity or amount adopted as a standard of measurement - such as dollars - hours - or grams






50. A numerical summary of how tightly the values are clustered around the 'center'