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






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






3. 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






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






5. Numerically valued attribute of a model






6. Distributions with more than two modes






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






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






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






10. A normal model with a mean of 0 and a standard deviation of 1






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






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






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






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






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






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






17. Control - randomize - replicate - block






18. Shows a bar representing the count of each category in a categorical variable






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






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






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






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






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






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






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






26. 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






27. Bias introduced to a sample when individuals can choose on their own whether to participate in the sample






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






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






30. Gives a value in 'y-units per x-unit'; changes of one unit in x are associated with changes of b1 units in predicted values of y






31. The natural tendency of randomly drawn samples to differ






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






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






34. 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






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






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






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. The linear equation y-hat = b0 + b1x that satisfies the least squares criterion






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






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






41. The ____ we care about most is straight






42. The parts of a distribution that typically trail off on either side; they can be characterized as long or short






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






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






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






46. The difference between the first and third quartiles






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






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






49. Sampling schemes that combine several sampling methods






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