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






2. Alternative hypothesis






3. 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






4. 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






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






6. Complement of p






7. Test use normalcdf(ZTS -999)






8. Probability of event A






9. 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.






10. _______________ 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






11. Collection of information from a sample






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






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






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






15. Information about individuals in a population






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






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






18. Lowercase sigma; population standard deviaition






19. Mean - mode - median and midrange.






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






21. Collection of information from the whole population






22. 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






23. One extreme value can affect it dramatically.






24. 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






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






26. Population size






27. 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






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






29. Sum of the values






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






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






32. 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






33. 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






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






35. The important aspects of the data are called?






36. Mu; population mean






37. A method of data collection in which the objects of study are observed in their natural settings and the variables are recorded






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






39. 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






40. 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).






41. Range - standard deviation and variance.






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






43. Sample standard deviation






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






45. A numerical quantity measuring some aspect of the population






46. 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






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






48. The number of times each data value occurs






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






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