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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. Type II error is measured






2. 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






3. Population proportion






4. Population size






5. 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






6. The important aspects of the data are called?






7. A subset of the population- it's important to choose a sample at random to avoid bias in the results






8. Sample mean






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






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






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






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






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






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






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






16. Population variance






17. Mean - mode - median and midrange.






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






19. Mu; population mean






20. Is a number that describes a characteristic of a population






21. A numerical quantity measuring some aspect of the population






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






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






24. Information about individuals in a population






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






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






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






28. Capital sigma; summation






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






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






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






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






33. 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






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






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






36. 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






37. 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






38. Lowercase sigma; population standard deviaition






39. Probability of event A






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






41. 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






42. Sample size or number of trials






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






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






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






46. Always use a equal symbol






47. Sample proportion






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






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






50. _______________ 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