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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. 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






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






3. 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






4. Population size






5. To find the range subtract the lowest value by the highest value.






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






7. Is denoted by 'N' - is the number of data values in the population






8. Double the answer from step 1 or step 2 (on whichever side your test statistics falls).






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






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






11. Sample mean






12. Always use a equal symbol






13. Sample variance






14. Occur when one does not affect the probability of the occurrence of the other.






15. To divide the population into 2 or more non-overlapping subsets called strata






16. _______________ of a numerical variable represents the data values of the variable from the lowest to the highest value along with the number of times each data value occurs






17. Is a collection of several data pertaining to one or more variables






18. Mean - mode - median and midrange.






19. Population is organized into groups (i.e - neighborhoods/departments) - and sampling unit is selected by a simple random sample






20. _______________ are numerical measurements that can assume any value between two numbers






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






22. The number of times each data value occurs






23. Collection of information from the whole population






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






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






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






27. 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






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






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






30. 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.






31. Lowercase sigma; population standard deviaition






32. Test use normalcdf(ZTS -999)






33. An individual data value which lies far (above or below) from most or all of the other data values within a distribution






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






35. Collection of information from a sample






36. A number that is used to describe a characteristic of a sample - such as a sample average - is called a __________.






37. Probability of event A






38. 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






39. When the distribution of the data values greater than the center of the display - and the data values less than the center of the display are mirror images of each other






40. Null hypothesis






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






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






43. One extreme value can affect it dramatically.






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






45. A descriptive tool used to visually describe the characteristics and relationships of collections of data quickly and attractively






46. 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






47. Type II error is measured






48. Parameter






49. Create a sample by using data from population members that are readily available






50. Variable where the value is a number that results from a measurement process - also called numerical data