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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. Information about individuals in a population






2. _______________ 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






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






4. Mean - mode - median and midrange.






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






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






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






8. 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






9. Sum of the values






10. Null hypothesis






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






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






13. Population size






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






15. Always use a equal symbol






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






17. Standard scores and percentile






18. Sample variance






19. 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






20. 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.






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






22. Sample proportion






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






24. Collection of information from a sample






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






26. 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






27. Sample size or number of trials






28. Statistics






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






30. Type II error is measured






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






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






33. A numerical quantity measuring some aspect of the population






34. 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






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






36. Collection of information from the whole population






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






38. Capital sigma; summation






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






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






41. Probability of event A






42. Using graphs and numerical summaries to describe variables in a data set and their relationship






43. 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






44. Lowercase sigma; population standard deviaition






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






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






47. 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






48. Type of bar graph that shows frequency distributions






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






50. One extreme value can affect it dramatically.