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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. Sample size or number of trials






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






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






4. Always use a equal symbol






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






6. 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






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






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






9. 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






10. Probability of event A






11. Alternative hypothesis






12. Collection of information from the whole population






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






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






15. Sample proportion






16. Range - standard deviation and variance.






17. 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






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






19. Parameter






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






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






22. _______________ 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






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






24. 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






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






26. 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






27. 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.






28. Type of bar graph that shows frequency distributions






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






30. A numerical quantity measuring some aspect of the population






31. Type II error is measured






32. Statistics






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






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






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






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






37. 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






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






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






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






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






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






43. Standard scores and percentile






44. 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






45. 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






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






47. Lowercase sigma; population standard deviaition






48. Test use normalcdf(ZTS -999)






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






50. Sample mean







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Can you answer 50 questions in 15 minutes?


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