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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. 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






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






3. 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






4. The process - intervention - or other controlled circumstance applied to randomly assigned experimental units






5. 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






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






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






8. Tells how many standard deviations a value is from the mean; have a mean of zero and a standard deviation of one






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






10. The natural tendency of randomly drawn samples to differ






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






12. Design Randomization occurring within blocks






13. An individual about whom or which we have data






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






15. A treatment known to have no effect - administered so that all groups experience the same conditions






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






17. Displays data that change over time






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






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






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






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






22. Distributions with two modes






23. Holds information about the same characteristic for many cases






24. The number of individuals in a sample






25. Each predicted y-hat tends to be fewer standard deviations from its mean than its corresponding x was from its mean






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






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






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






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






30. Models random events by using random numbers to specify event outcomes with relative frequencies that correspond to the true real-world relative frequencies we are trying to model






31. Adding a constant to each data value adds the same constant to the mean - the median - and the quartiles - but does not change the standard deviation or IQR






32. The difference between the first and third quartiles






33. An observational study in which subjects are followed to observe future outcomes






34. Shows quantitative data values in a way that sketches the distribution of the data






35. A study based on data in which no manipulation of factors has been employed






36. When an observed difference is too large for us to believe that is is likely to have occurred naturally






37. The ____ we care about most is straight






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






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






40. A distribution that's roughly flat






41. When both those who could influence and evaluate the results are blinded






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






43. Control - randomize - replicate - block






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






45. If data consist of two or more groups that have been thrown together - it is usually best to fit different linear models to each group than to try to fit a single model to all of the data






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






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






48. 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






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






50. All experimental units have an equal chance of receiving any treatment