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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. 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






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






3. Collection of information from the whole population






4. 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






5. Population variance






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






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






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






9. Mean - mode - median and midrange.






10. Probability of event A






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






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






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






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






15. Alternative hypothesis






16. Sample mean






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






18. Always use a equal symbol






19. Sample standard deviation






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






21. Represents categories - and is nonnumerical in nature






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






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






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






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






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






27. 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






28. 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






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






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






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






32. Parameter






33. Null hypothesis






34. Is a sample containing similar characteristics of the population






35. Can be used to get an initial graphical view of data






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






37. Mu; population mean






38. Sample proportion






39. _______________ 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






40. One extreme value can affect it dramatically.






41. Range - standard deviation and variance.






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

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43. Population proportion






44. Members of the population select themselves by volunteering






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






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






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






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






49. Type of bar graph that shows frequency distributions






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







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Can you answer 50 questions in 15 minutes?


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