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DSST Intro To Statistics

Subjects : dsst, statistics
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. Standard scores and percentile






2. The variable value can be represented as isolated points on a number line






3. Is denoted by 'n' - is the number of data values in the sample






4. A flaw in the sampling procedure that makes it more likely that the sample will NOT be representative of population






5. A method of experimentation in which you can control as many variables as possible in order to isolate the effects of a response variable






6. A collection of individuals about which we want to draw conclusions






7. Is the portion of the population that is selected for study






8. Determine the location of the middle value of all the data values






9. A sample which is selected in such a manner - that each data value of the population has a non-zero probability of being selected for the sample






10. Lowercase sigma; population standard deviaition






11. To calculate the percentile take the number of values less than x - divide by total number of values and times by 100.






12. Can be used to get an initial graphical view of data






13. Uses numerical and or visual techniques to summarize or describe the data in a clear effective manner






14. A method in which you randomly choose one number from 'l' to 'k' and continue to select the kth element






15. (largest data value) - (smallest data value)






16. Middle value of a set of data values after they've been arranged in numerical order - 1. First arrange data values in numerical order 2. For odd # of data values - the median is the middle data value 3. For even # of data values - the median is the m






17. A numerical quantity measuring some aspect of the population






18. Is a number that describes a characteristic of a sample

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19. Is a number that describes a characteristic of a population






20. Level of measurement- Is the interval level modified to include the inherent zero starting point (where zero indicates that none of the quantity is present). For values at this level - differences and ratios are both meaningful. (Example) Ages of sur






21. Population size






22. Involves the procedures associated with the data collection process - the summarizing and interpretation of data - and the drawing of inferences or conclusions based on the analysis of the data






23. Disjoint events cannot overlap. They are mutually exclusive if they cannot occur at the same time.






24. An efficient method of graphing information using actual amounts: clusters - gaps - outliers are clearly identified.






25. A method in which each combination of people has an equal chance of being selected- the sample is representative of the population and is independent






26. A visual exploratory data analysis technique that shows the shape of a distribution - this kind of display uses the actual values of the variable to present the shape of the distribution of data values






27. Population variance






28. Alternative hypothesis






29. Sample variance






30. Type of information - usually a property of characteristic of a person or thing that is measured or observed






31. The level of significance and the probability of a type I error (rejecting a true null hypothesis). The area in the tail or tails of a distribution (z - t - or ?2); in hypothesis testing you don't always have a two tailed distribution as in confidenc






32. Data values that are either much larger or much smaller than the general body of data- they should be included in an analysis unless they are the result of human or other error






33. Collection of information from a sample






34. Is the process of selecting a portion - or sample - of the entire population






35. When the distribution of the data values tend to be concentrated toward one end of the display or tail of the distribution - while the data values in the other tail are spread out through extreme values resulting in a longer tail






36. Square the standard deviation and to find the population variance square of the population standard deviation






37. Is a sample of data values selected from a population in such a way that every sample of size 'n' has an equal probability of being selected and every data value of the population has the same chance of being selected for the sample






38. Sample proportion






39. One extreme value can affect it dramatically.






40. For a left tailed test use normalcdf(-999 - ZTS)






41. A survey that includes every item or individual of the population






42. Probability of event A






43. Level of measurement- Involves data that may be arranged in some order - but differences between data values either cannot be determined or are meaningless. (Example) Questions on a survey are scored with integers 1 thru 5 with 1 representing strong






44. Graph involving pictures of objects in which the size of the object in which the size of the object in the picture represents the relative size of the quantity being represented by the object.






45. Before they are arranged or analyzed - information or observations are called________.






46. Information about individuals in a population






47. Sample mean






48. Capital sigma; summation






49. A quantity calculated from data gathered from a sample- usually used to estimate a population parameter






50. A subset of the population- it's important to choose a sample at random to avoid bias in the results






Can you answer 50 questions in 15 minutes?



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