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






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






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






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






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






6. Is a sample containing similar characteristics of the population






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






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

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9. Lowercase sigma; population standard deviaition






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






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






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






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






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






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






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






17. 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






18. The important aspects of the data are called?






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






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






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






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






23. _______________ 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






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






25. Population size






26. Mean - mode - median and midrange.






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






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






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






30. One extreme value can affect it dramatically.






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






32. Mu; population mean






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






34. A method in which each combination of people has an equal chance of being selected- the sample is representative of the population and is independent






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






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






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






38. Probability of event A






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






40. 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






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






42. Alternative hypothesis






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






44. 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






45. Members of the population select themselves by volunteering






46. Type II error is measured






47. 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






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






49. Type of bar graph that shows frequency distributions






50. Sum of the values