Test your basic knowledge |

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. Null hypothesis






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






3. Members of the population select themselves by volunteering






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






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






6. A numerical quantity measuring some aspect of the population






7. 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






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






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






10. Sample standard deviation






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






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






13. Collection of information from the whole population






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






15. Mean - mode - median and midrange.






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






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






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






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






20. Test use normalcdf(ZTS -999)






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






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






23. 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






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






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






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


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






28. _______________ 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






29. 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






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






31. 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






32. Population variance






33. Standard scores and percentile






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






35. Type of bar graph that shows frequency distributions






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






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. Represents categories - and is nonnumerical in nature






39. Collection of information from a sample






40. 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






41. Sample variance






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






43. Sample proportion






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






45. Complement of p






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






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






48. 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).






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






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