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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 number of times each data value occurs






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






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

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






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






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






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






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






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






10. Is a sample containing similar characteristics of the population






11. Collection of information from the whole population






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






13. Mean - mode - median and midrange.






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






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






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






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






18. 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






19. Mu; population mean






20. Null hypothesis






21. Type II error is measured






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






23. Standard scores and percentile






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






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






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






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






28. 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






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






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






31. 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






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






33. Complement of p






34. Members of the population select themselves by volunteering






35. Probability of event A






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






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






38. Parameter






39. 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






40. Capital sigma; summation






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






42. The important aspects of the data are called?






43. 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






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






45. Sample variance






46. 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






47. 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.






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






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






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