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






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






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






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






5. Sample variance






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






7. Alternative hypothesis






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






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






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






11. The number of times each data value occurs






12. Statistics






13. 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






14. Population proportion






15. Mu; population mean






16. Parameter






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






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






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






20. Lowercase sigma; population standard deviaition






21. 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






22. 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






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






24. Is a sample containing similar characteristics of the population






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






26. Always use a equal symbol






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






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






29. 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






30. 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






31. Complement of p






32. Sample standard deviation






33. 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).






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






35. Is the process of selecting a portion - or sample - of the entire population






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






37. 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






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






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






40. Range - standard deviation and variance.






41. Information about individuals in a population






42. Type of bar graph that shows frequency distributions






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






44. Test use normalcdf(ZTS -999)






45. A numerical quantity measuring some aspect of the population






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






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






48. Sample proportion






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






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