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






2. Range - standard deviation and variance.






3. 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






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






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






6. Null hypothesis






7. The important aspects of the data are called?






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






9. Always use a equal symbol






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






11. Mean - mode - median and midrange.






12. A numerical quantity measuring some aspect of the population






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






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






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






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






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






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






19. Test use normalcdf(ZTS -999)






20. Statistics






21. 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






22. 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






23. Lowercase sigma; population standard deviaition






24. Members of the population select themselves by volunteering






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






26. 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






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






28. Sample standard deviation






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






30. 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.






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






32. Sample variance






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






34. Capital sigma; summation






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






36. Information about individuals in a population






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






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






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






40. Parameter






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






42. 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






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






44. 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






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






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






47. Population proportion






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






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






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