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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 collection of individuals about which we want to draw conclusions






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






3. 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






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






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






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






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






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






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






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






11. 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






12. _______________ are numerical values that can assume only a limited number of values






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






14. Population variance






15. Capital sigma; summation






16. Alternative hypothesis






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






18. Null hypothesis






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






20. 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






21. Statistics






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






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






24. 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.






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






26. Sample proportion






27. Mean - mode - median and midrange.






28. 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).






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






30. The important aspects of the data are called?






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






32. Always use a equal symbol






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






34. Sum of the values






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






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






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






38. Population proportion






39. Sample standard deviation






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






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






42. 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






43. 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






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






45. Type of bar graph that shows frequency distributions






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






47. One extreme value can affect it dramatically.






48. Population size






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


50. Mu; population mean