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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. Holds information about the same characteristic for many cases






2. A sampling scheme that biases the sample in a way that gives a part of the population less representation than it has in the population






3. Numerically valued attribute of a model






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






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






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






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






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






9. The square root of the variance






10. A distribution is this if it's not symmetric and one tail stretches out farther than the other






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






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






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






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






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






16. A distribution that's roughly flat






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






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






19. 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






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






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






22. An individual result of a component of a simulation






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






24. Doing this is equivalent to changing its units






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






26. Distributions with two modes






27. Consists of the individuals who are conveniently available






28. Useful family of models for unimodal - symmetric distributions






29. Displays data that change over time






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






31. This of sample size n is one in which each set of n elements in the population has an equal chance of selection






32. 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






33. 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






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






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






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






37. Anything in a survey design that influences response






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






39. A sample that consists of the entire population






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






41. The number of individuals in a sample






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






43. A positive ____ or association means that - in general - as one variable increases - so does the other; when increases in one variable generally correspond to decreases in the other - the association is negative






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






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






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






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






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






49. Shows how a 'whole' divides into categories by showing a wedge of a circle whose area corresponds to the proportion in each category






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