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






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






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






4. 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






5. Complement of p






6. Range - standard deviation and variance.






7. 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






8. Probability of event A






9. Population variance






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






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






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






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






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






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






16. 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






17. 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






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






19. Sample proportion






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






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






22. Collection of information from a sample






23. The important aspects of the data are called?






24. Mean - mode - median and midrange.






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






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






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






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






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






30. Statistics






31. The pattern of variation of data. The distribution may be described as symmetrical - positively skewed - or negatively skewed






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






33. Alternative hypothesis






34. Sample size or number of trials






35. 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






36. 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






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

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38. 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






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






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






41. Sample mean






42. 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






43. Mu; population mean






44. 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).






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






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






47. Population size






48. _______________ of a numerical variable represents the data values of the variable from the lowest to the highest value along with the number of times each data value occurs






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






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