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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. Sample mean






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






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

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






5. A numerical quantity measuring some aspect of the population






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






7. Sum of the values






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






10. The important aspects of the data are called?






11. Probability of event A






12. 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






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






14. Sample variance






15. Is a sample containing similar characteristics of the population






16. Capital sigma; summation






17. Test use normalcdf(ZTS -999)






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






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






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






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






22. 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






23. 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






24. 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






25. Range - standard deviation and variance.






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






27. Mean - mode - median and midrange.






28. Population variance






29. Members of the population select themselves by volunteering






30. Mu; population mean






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






32. The number of times each data value occurs






33. Represents categories - and is nonnumerical in nature






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






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






36. Is the entire collection of all individuals or objects of interest






37. Standard scores and percentile






38. Information about individuals in a population






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






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






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






42. Lowercase sigma; population standard deviaition






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






44. 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






45. 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






46. 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






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






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






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






50. Parameter