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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. Mean - mode - median and midrange.






2. Population size






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






4. 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






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






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






7. Statistics






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






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






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






11. 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






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






13. Members of the population select themselves by volunteering






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






15. A numerical quantity measuring some aspect of the population






16. _______________ 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






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






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






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

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20. Sample variance






21. Alternative hypothesis






22. Parameter






23. Collection of information from a sample






24. One extreme value can affect it dramatically.






25. Variable where the value is a number that results from a measurement process - also called numerical data






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






27. The number of times each data value occurs






28. 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






29. Test use normalcdf(ZTS -999)






30. 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






31. Always use a equal symbol






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






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






34. 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






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






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






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






38. Sum of the values






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






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






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






42. Level of measurement- Is like the ordinal level - with the additional property that we can determine meaningful amounts of differences between data. However - there is no inherent (natural) zero starting point (where none of the quantity is present).






43. Sample mean






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






45. Is a sample containing similar characteristics of the population






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






47. 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






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






49. Population variance






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







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