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






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






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. Represents categories - and is nonnumerical in nature






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






6. Population proportion






7. Sum of the values






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






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






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






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






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






13. Statistics






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






15. Type of bar graph that shows frequency distributions






16. A numerical quantity measuring some aspect of the population






17. 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






18. Lowercase sigma; population standard deviaition






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






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






21. Capital sigma; summation






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






23. Sample proportion






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






25. Members of the population select themselves by volunteering






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






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






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

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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. Collection of information from a sample






31. The important aspects of the data are called?






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






33. Graph involving pictures of objects in which the size of the object in which the size of the object in the picture represents the relative size of the quantity being represented by the object.






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






35. Null hypothesis






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






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






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






39. 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






40. 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






41. 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






42. Mean - mode - median and midrange.






43. Information about individuals in a population






44. Population variance






45. One extreme value can affect it dramatically.






46. 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






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






48. Mu; population mean






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






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