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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. Mean - mode - median and midrange.






2. Population size






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






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






5. Null hypothesis






6. 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






7. Population proportion






8. Alternative hypothesis






9. Sample size or number of trials






10. Statistics






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






12. 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






13. Sample standard deviation






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






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






16. The important aspects of the data are called?






17. Information about individuals in a population






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






19. Mu; population mean






20. 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






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. Type of bar graph that shows frequency distributions






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






24. 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






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. Population variance






27. Lowercase sigma; population standard deviaition






28. Parameter






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






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






31. Complement of p






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






33. 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






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






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






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






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






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






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






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






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






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






43. Capital sigma; summation






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

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45. Always use a equal symbol






46. 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






47. One extreme value can affect it dramatically.






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






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






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