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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. 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






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






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






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






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






6. 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






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






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






9. Alternative hypothesis






10. Null hypothesis






11. Complement of p






12. Sample variance






13. Collection of information from a sample






14. Sample standard deviation






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






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






17. Capital sigma; summation






18. 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






19. Population proportion






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






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






22. Square the standard deviation and to find the population variance square of the population standard deviation






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






24. The important aspects of the data are called?






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






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






27. Is a sample containing similar characteristics of the population






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






29. Sample proportion






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






31. Type of bar graph that shows frequency distributions






32. Parameter






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






34. Always use a equal symbol






35. 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






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






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






38. A numerical quantity measuring some aspect of the population






39. Sum of the values






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






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






42. Range - standard deviation and variance.






43. Mu; population mean






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






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

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46. 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






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






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






49. 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






50. 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







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