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






2. 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






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






5. Capital sigma; summation






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






7. One extreme value can affect it dramatically.






8. Collection of information from the whole population






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. Sample mean






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






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






13. Represents categories - and is nonnumerical in nature






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






15. Standard scores and percentile






16. Type of bar graph that shows frequency distributions






17. 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






18. Statistics






19. Sum of the values






20. Population variance






21. Sample variance






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






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






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






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






26. Mean - mode - median and midrange.






27. Population proportion






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






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






30. Population size






31. Probability of event A






32. Is the entire collection of all individuals or objects of interest






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






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






35. 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






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






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






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






39. Mu; population mean






40. The number of times each data value occurs






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






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






43. Is a sample containing similar characteristics of the population






44. Type II error is measured






45. _______________ are numerical values that can assume only a limited number of values






46. Always use a equal symbol






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






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






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






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