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






2. Population size






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






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






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






6. Population proportion






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






8. Members of the population select themselves by volunteering






9. Sample mean






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






11. The number of times each data value occurs






12. Sample proportion






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






14. Alternative hypothesis






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






16. Test use normalcdf(ZTS -999)






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






18. Statistics






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






20. 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






21. Mean - mode - median and midrange.






22. 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






23. 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






24. 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






25. 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






26. Standard scores and percentile






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

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






29. Represents categories - and is nonnumerical in nature






30. _______________ 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






31. 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






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






33. Always use a equal symbol






34. Sum of the values






35. One extreme value can affect it dramatically.






36. Population variance






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






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






39. Type of bar graph that shows frequency distributions






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






41. 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






42. Mu; population mean






43. 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






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






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






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






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






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






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






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