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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 number that describes a characteristic of a population






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






3. 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






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






5. Collection of information from a sample






6. Alternative hypothesis






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






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






9. The important aspects of the data are called?






10. 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






11. 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






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






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






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






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


16. Mu; population mean






17. 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






18. Type of bar graph that shows frequency distributions






19. 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






20. Sample variance






21. Always use a equal symbol






22. Null hypothesis






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






24. Sample size or number of trials






25. 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






26. 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






27. Population size






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






29. _______________ 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






30. 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.






31. 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






32. Sum of the values






33. Represents categories - and is nonnumerical in nature






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






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






36. Level of measurement- involves data that consist of names - labels and categories only. The data cannot be arranged in an ordering scheme (such as low to high). (Example) Nationalities of survey respondents






37. Standard scores and percentile






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






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






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






41. Range - standard deviation and variance.






42. A numerical quantity measuring some aspect of the population






43. Type II error is measured






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






45. 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






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






47. Capital sigma; summation






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






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






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