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






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






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






4. 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






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






6. Population variance






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






8. The important aspects of the data are called?






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






10. 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






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






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






13. Type II error is measured






14. 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






15. Members of the population select themselves by volunteering






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






17. Sample size or number of trials






18. 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






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






20. Always use a equal symbol






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






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






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






24. Mean - mode - median and midrange.






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






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






27. Sample proportion






28. 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






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






30. Mu; population mean






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






32. 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






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






34. Complement of p






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






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






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

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






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






40. Sum of the values






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






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






43. 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






44. 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






45. Probability of event A






46. Test use normalcdf(ZTS -999)






47. Alternative hypothesis






48. 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






49. Represents categories - and is nonnumerical in nature






50. Information about individuals in a population