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






2. 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






3. Information about individuals in a population






4. Probability of event A






5. Population variance






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






7. Sample proportion






8. One extreme value can affect it dramatically.






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






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






11. Type of bar graph that shows frequency distributions






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






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






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






15. 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






16. 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






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






18. A numerical quantity measuring some aspect of the population






19. Population proportion






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






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






22. Is a sample containing similar characteristics of the population






23. Always use a equal symbol






24. Represents categories - and is nonnumerical in nature






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






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






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






28. Level of measurement- Is like the ordinal level - with the additional property that we can determine meaningful amounts of differences between data. However - there is no inherent (natural) zero starting point (where none of the quantity is present).






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






30. 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






31. Alternative hypothesis






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






33. The number of times each data value occurs






34. Type II error is measured






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






36. _______________ 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






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






38. 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






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






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






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






42. 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






43. Standard scores and percentile






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

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45. Sample standard deviation






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






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






48. Capital sigma; summation






49. The important aspects of the data are called?






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






Can you answer 50 questions in 15 minutes?



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