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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. 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






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






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






4. 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






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






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






7. _______________ 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






8. Null hypothesis






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






10. Statistics






11. Type II error is measured






12. Range - standard deviation and variance.






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






15. 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






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






17. One extreme value can affect it dramatically.






18. Sample proportion






19. A numerical quantity measuring some aspect of the population






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






21. 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






22. Population variance






23. Members of the population select themselves by volunteering






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






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






26. Sample size or number of trials






27. The important aspects of the data are called?






28. Parameter






29. 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






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






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






32. Complement of p






33. Population size






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






35. The number of times each data value occurs






36. Mean - mode - median and midrange.






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






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






39. Probability of event A






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






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






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






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






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






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






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






47. Capital sigma; summation






48. Always use a equal symbol






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






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