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






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






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






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






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






6. Always use a equal symbol






7. 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






8. Information about individuals in a population






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






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






11. Standard scores and percentile






12. Mu; population mean






13. Sample mean






14. 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






15. Sample proportion






16. Sample standard deviation






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






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






19. Statistics






20. A number that is used to describe a characteristic of a sample - such as a sample average - is called a __________.






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






22. Capital sigma; summation






23. Members of the population select themselves by volunteering






24. Population proportion






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






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






27. 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






28. 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






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






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






31. To find the range subtract the lowest value by the highest value.






32. Parameter






33. 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






34. Lowercase sigma; population standard deviaition






35. Sample variance






36. 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.






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






38. 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






39. A numerical quantity measuring some aspect of the population






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






41. Null hypothesis






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






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






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






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






46. Involves the procedures associated with the data collection process - the summarizing and interpretation of data - and the drawing of inferences or conclusions based on the analysis of the data






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






48. Probability of event A






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






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