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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. Always use a equal symbol






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






3. Population variance






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






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






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

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






8. The important aspects of the data are called?






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






10. Is a sample that has the pertinent characteristics of the population in the same proportion - as they are included in that population






11. Sample mean






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






13. Statistics






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






16. Members of the population select themselves by volunteering






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






18. Sample standard deviation






19. 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






20. Null hypothesis






21. Lowercase sigma; population standard deviaition






22. 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






23. 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






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






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






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






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






28. 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






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






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






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






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






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






34. Collection of information from the whole population






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






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






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






38. 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).






39. Range - standard deviation and variance.






40. One extreme value can affect it dramatically.






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






42. 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






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






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






45. Test use normalcdf(ZTS -999)






46. 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






47. Alternative hypothesis






48. 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.






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






50. Is a sample containing similar characteristics of the population