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






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






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






4. Population variance






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






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






7. A numerical quantity measuring some aspect of the population






8. 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.






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






10. Information about individuals in a population






11. 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






12. 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






13. Data values that are either much larger or much smaller than the general body of data- they should be included in an analysis unless they are the result of human or other error






14. 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






15. 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






16. Collection of information from a sample






17. 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






18. Sum of the values






19. Test use normalcdf(ZTS -999)






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. To divide the population into 2 or more non-overlapping subsets called strata






22. Statistics






23. Type of bar graph that shows frequency distributions






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






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






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






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






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






29. Type II error is measured






30. Level of measurement- Is like the ordinal level - with the additional property that we can determine meaningful amounts of differences between data. However - there is no inherent (natural) zero starting point (where none of the quantity is present).






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






32. The important aspects of the data are called?






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






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






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

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






37. Capital sigma; summation






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






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






40. Sample variance






41. 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






42. Represents categories - and is nonnumerical in nature






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






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






45. 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






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






47. The number of times each data value occurs






48. One extreme value can affect it dramatically.






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






50. 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