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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. 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






2. Sample mean






3. 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






4. 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






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






6. 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






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






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






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






10. 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






11. Type of bar graph that shows frequency distributions






12. Sample standard deviation






13. Statistics






14. Capital sigma; summation






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






16. 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






17. 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






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






19. Has the same shape and horizontal scale as a histogram - but the vertical scale is marked with relative frequencies instead of actual frequencies






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






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






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






23. Mean - mode - median and midrange.






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






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






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






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






28. A method of data collection in which the objects of study are observed in their natural settings and the variables are recorded






29. Sum of the values






30. Mu; population mean






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






32. Always use a equal symbol






33. Population size






34. Parameter






35. Collection of information from the whole population






36. Population proportion






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






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






39. Null hypothesis






40. Occur when one of them affects the probability of the other.






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






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






43. A method of data collection where the researcher selects a sample from the population and measures the variable of interest






44. 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






45. _______________ 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






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






47. Members of the population select themselves by volunteering






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






49. One extreme value can affect it dramatically.






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