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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. 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






2. Sample size or number of trials






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






4. 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






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






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






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






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






9. Population proportion






10. 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






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






12. Capital sigma; summation






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






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






15. The important aspects of the data are called?






16. Always use a equal symbol






17. Population size






18. Complement of p






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






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






21. Information about individuals in a population






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






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






24. Collection of information from a sample






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






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






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






28. Sample standard deviation






29. 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






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






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






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






33. Represents categories - and is nonnumerical in nature






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






35. Mu; population mean






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






37. Level of measurement- involves data that consist of names - labels and categories only. The data cannot be arranged in an ordering scheme (such as low to high). (Example) Nationalities of survey respondents






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






39. _______________ 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






40. Lowercase sigma; population standard deviaition






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






42. Is a sample containing similar characteristics of the population






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






44. A numerical quantity measuring some aspect of the population






45. 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






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

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






48. The number of times each data value occurs






49. Collection of information from the whole population






50. 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