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






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






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






5. Always use a equal symbol






6. 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






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






8. 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






9. Type II error is measured






10. Is a sample that has the pertinent characteristics of the population in the same proportion - as they are included in that population






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






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






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






14. Members of the population select themselves by volunteering






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






16. 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






17. 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






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






19. 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






20. Statistics






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






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






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






24. 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






25. Capital sigma; summation






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






27. The number of times each data value occurs






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






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






30. Information about individuals in a population






31. Population proportion






32. Sample standard deviation






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






34. Using graphs and numerical summaries to describe variables in a data set and their relationship






35. Null hypothesis






36. _______________ 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






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

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38. Is the process of using SAMPLE INFORMATION to draw inferences or conclusions about the POPULATION






39. A numerical quantity measuring some aspect of the population






40. Collection of information from a sample






41. The important aspects of the data are called?






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






43. Collection of information from the whole population






44. Sample mean






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






46. 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






47. Population variance






48. Probability of event A






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






50. 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