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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. 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






2. Range - standard deviation and variance.






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






4. Is the portion of the population that is selected for study






5. Alternative hypothesis






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






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






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






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






10. 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






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






12. 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






13. Null hypothesis






14. 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






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






16. Sample proportion






17. Complement of p






18. The important aspects of the data are called?






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






20. Lowercase sigma; population standard deviaition






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






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






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


24. Is a sample containing similar characteristics of the population






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






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






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






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






29. Collection of information from a sample






30. Collection of information from the whole population






31. Type II error is measured






32. _______________ 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






33. A numerical quantity measuring some aspect of the population






34. 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






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






36. 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






37. Mean - mode - median and midrange.






38. Sample size or number of trials






39. The number of times each data value occurs






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






41. Sample variance






42. Represents categories - and is nonnumerical in nature






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






44. Parameter






45. Sum of the values






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






47. 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






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






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






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