Test your basic knowledge |

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






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






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






4. The difference between the first and third quartiles






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






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






7. Anything in a survey design that influences response






8. Individuals on whom an experiment is performed






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






10. The number of individuals in a sample






11. Distributions with two modes






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






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






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






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






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






17. 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






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






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






20. 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






21. Sampling schemes that combine several sampling methods






22. 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






23. A variable whose values are compared across different treatments






24. 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






25. An individual about whom or which we have data






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






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






28. Distributions with more than two modes






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






30. 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






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






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






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






34. A variable whose levels are controlled by the experimenter






35. Control - randomize - replicate - block






36. 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






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






38. 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






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






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






41. 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






42. 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






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






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






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






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






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






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






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






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