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






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






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






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






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






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






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






8. Probability of event A






9. Population variance






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






11. 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






12. Sample variance






13. The important aspects of the data are called?






14. Always use a equal symbol






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






16. Sample proportion






17. 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






18. Type II error is measured






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






20. Lowercase sigma; population standard deviaition






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






22. Sample mean






23. Mean - mode - median and midrange.






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

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25. Statistics






26. Information about individuals in a population






27. The pattern of variation of data. The distribution may be described as symmetrical - positively skewed - or negatively skewed






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






29. Null hypothesis






30. Test use normalcdf(ZTS -999)






31. Sample size or number of trials






32. 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






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






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






35. 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






36. 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






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






38. Collection of information from a sample






39. Population proportion






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






41. Sum of the values






42. Complement of p






43. Is a sample containing similar characteristics of the population






44. Represents categories - and is nonnumerical in nature






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






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






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






48. 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






49. Sample standard deviation






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