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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 variance






2. Population proportion






3. A numerical quantity measuring some aspect of the population






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






6. 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.






7. 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).






8. 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






9. Population size






10. 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






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






12. Range - standard deviation and variance.






13. Sample proportion






14. Type II error is measured






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






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






17. 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






18. Represents categories - and is nonnumerical in nature






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






20. Information about individuals in a population






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






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






23. Mu; population mean






24. Sample standard deviation






25. To divide the population into 2 or more non-overlapping subsets called strata






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






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






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. 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






30. Population variance






31. Statistics






32. 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






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






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






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






36. Sample mean






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






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






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






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






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






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






43. 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






44. Collection of information from a sample






45. Null hypothesis






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






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






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






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






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