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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. 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






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






3. 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






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






5. Mean - mode - median and midrange.






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






7. Type II error is measured






8. 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






9. Probability of event A






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






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






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






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






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






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






16. Alternative hypothesis






17. Sum of the values






18. 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.






19. 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).






20. 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






21. Sample variance






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






23. One extreme value can affect it dramatically.






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






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






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






27. 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






28. 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






29. Type of bar graph that shows frequency distributions






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






31. Members of the population select themselves by volunteering






32. Sample size or number of trials






33. Sample mean






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






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






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






37. Lowercase sigma; population standard deviaition






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






39. 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






40. 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






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






42. Test use normalcdf(ZTS -999)






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






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






45. Null hypothesis






46. A numerical quantity measuring some aspect of the population






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






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






49. 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






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







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Can you answer 50 questions in 15 minutes?


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