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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. Sample variance






2. _______________ 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






3. Sample size or number of trials






4. 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






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






6. Represents categories - and is nonnumerical in nature






7. 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






8. Parameter






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






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






11. Complement of p






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






13. Collection of information from a sample






14. 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






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






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






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






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






19. Population proportion






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






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






22. Lowercase sigma; population standard deviaition






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






24. Null hypothesis






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






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






27. 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






28. Sample proportion






29. Members of the population select themselves by volunteering






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






31. The important aspects of the data are called?






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






33. The number of times each data value occurs






34. Sum of the values






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






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






37. Probability of event A






38. 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






39. 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.






40. Mu; population mean






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






42. Range - standard deviation and variance.






43. Population size






44. 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






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






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






47. 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






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






49. Test use normalcdf(ZTS -999)






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