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






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






4. Population proportion






5. Is a sample that has the pertinent characteristics of the population in the same proportion - as they are included in that population






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






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






8. Members of the population select themselves by volunteering






9. A numerical quantity measuring some aspect of the population






10. 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






11. Represents categories - and is nonnumerical in nature






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






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






14. Probability of event A






15. Always use a equal symbol






16. 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.






17. Sample mean






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






19. One extreme value can affect it dramatically.






20. Lowercase sigma; population standard deviaition






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






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






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






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






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






26. 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).






27. Mu; population mean






28. Information about individuals in a population






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






30. Type II error is measured






31. Range - standard deviation and variance.






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






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

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






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






36. Population variance






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






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






39. Null hypothesis






40. Alternative hypothesis






41. 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






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






43. Collection of information from the whole population






44. 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






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






46. Sample proportion






47. Parameter






48. The number of times each data value occurs






49. 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






50. 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