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






2. To be valid - an experiment must assign experimental units to treatment groups at random






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






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






5. Summarized with the mean or the median






6. Having one mode; this is a useful term for describing the shape of a histogram when it's generally mound-shaped






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






8. A variable that is not explicitly part of a model but affects the way the variables in the model appear to be related






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






10. This criterion specifies the unique line that minimizes the variance of the residuals or - equivalently - the sum of the squared residuals






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






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






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






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






15. A sample drawn by selecting individuals systematically from a sampling frame






16. 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






17. 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






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






19. A variable in which the numbers act as numerical values; always has units






20. Ideally tells who was measured - what was measured - how the data were collected - where the data were collected - and when and why the study was performed






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






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






23. Shows the relationship between two quantitative variables measured on the same cases






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






25. A representative subset of a population - examined in hope of learning about the population






26. The sequence of several components representing events that we are pretending will take place






27. When doing this - consider their shape - center - and spread






28. Displays data that change over time






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






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






31. Manipulates factor levels to create treatments - randomly assigns subjects to these treatment levels - and then compares the responses of the subject groups across treatment levels






32. The sum of squared deviations from the mean - divided by the count minus one






33. The natural tendency of randomly drawn samples to differ






34. Distributions with two modes






35. Data points whose x-values are far from the mean of x are said to exert ____ on a linear model; with high enough ____ - residuals can appear to be deceptively small






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






37. A study that asks questions of a sample drawn from some population in the hope of learning something about the entire population






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






39. Anything in a survey design that influences response






40. Holds information about the same characteristic for many cases






41. The ____ we care about most is straight






42. The square of the correlation between y and x; gives the fraction of the variability of y accounted for by the least squares linear regression on x; an overall measure of how successful the regression is in linearly relating y to x






43. Numerically valued attribute of a model






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






45. The number of individuals in a sample






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






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






48. The ith ___ is the number that falls above i% of the data






49. An equation or formula that simplifies and represents reality






50. Graphs a dot for each case against a single axis