Statistics Ch. 1-3

Card Set Information

Statistics Ch. 1-3
2013-06-23 20:54:37

Study flashcards
Show Answers:

  1. what is population?
    collection of all outcomes, responses, counts, and measurements that are of interest
  2. what is a sample?
    a subset, part of a population
  3. what is parameter?
    number description for population
  4. what is statistic? (not statisticS)
    a number description for a sample
  5. Describe Descriptive Statistics
    branch of statisticS that has organization, summary, and display of data

    no conclusions are drawn
  6. Describe inferential statistics
    part of statisticS that has conclusions drawn based on a given data
  7. give an example of parameter
    In a survey of 2000 people
  8. give an example of statistic
    in a survey 20 out of 2000 people
  9. give an example of descriptive statistics
    for unmarried men, 70% were alive at age 65
  10. give an example of inferential statistics
    for married men 90% were alive at 65

    ....being married prolongs your life
  11. what is qualitative data?
    attributes, labels, or non-numbered entries
  12. what is quantitative data?
    consists of numerical measurement or counts
  13. Is nominal level of measurement the lowest?
  14. describe nominal level of measurement
    • qualitative
    • category of names, labels, qualities
    • no math can be used
  15. at what number level is the ordinal level of measurement?
    2..after nominal
  16. describe ordinal level of measurement
    • qualitative or quantitative
    • data can be arranged in order but it does not matter
  17. what level is the interval level of measurement?
    3...after nominal and ordinal
  18. what is the acronym for the level of measurement?
    • Nominal
    • Ordinal
    • Interval
    • Ratio
  19. describe interval level of measurement
    • entries can be ordered
    • meaningful differences for data entries can use math
    • *zero means a position on a scale*
    • zero is not an inherent zero meaning doesn't mean NONE
  20. what level is the ration level of measurement?
  21. describe ratio level of measurement
    • similar to interval level
    • can use math
    • zero means NONE..."inherent zero"
    • a ratio from data can be made so it can be a expressed as a *multiple* of another
  22. describe what a frequency histogram is
    • a BAR graph that represents the FREQUENCY distribution of a data set:
    • x-axis is quantitative and measures the data values
    • y-axis measures the FREQUENCY 
  23. describe what a frequency polygon graph is
    a LINE graph that explains the continuous change in frequencies for FREQUENCY HISTOGRAM
  24. Describe 6 methods of data collection
    • 1. identify variables
    • 2. make a detailed plan for collecting data
    • 3. collect data
    • 4. describe data using stats. techniques
    • 5. interpret data
    • 6. identify errors
  25. what is observational study?
    researcher observes and measures characteristics of interest
  26. what is experiment?
    a treatment is applied to part of a population and responses are observed
  27. what is simulation?
    • use math or physical model to make the conditions of a simulation or process
  28. What is Survey?
    • an investigation of one or more characteristics of a population
    • mostly done by interviews and mail or phone
  29. Describe elements of experimental design: Control
    for effects other than one being observed
  30. what is confounding variables?
    when an experimenter can't tell the difference between the effects or different factors on a variable
  31. what is placebo effect?
    when a subject reacts positively to a treatment when there's actually no medical treatment..."all in the head"
  32. what is blinding?
    subject doesn't know if he/she receives a treatment or placebo
  33. what is double-blinding?
    • when the experimenter or subject knows if the subject is receiving a treatment or a placebo..
    • usually has a third-party involve
  34. what is Randomization?
    randomly assigning subjects to different treatment groups
  35. what is completely randomized design?
    subjects are assigned to different treatment groups through random selection
  36. what i randomized block design?
    • divide subjects with similar characteristics into blocks
    • in each block, randomly assign subject into treatment groups
  37. what is matched pairs design?
    • subjects are paired according to similarity. One subject in the pair is randomly picked to receive one treatment while the other receives a different treatment
    • *like twins experiment*
  38. what is replication?
    *repetition* of experiment using a large group of subjects
  39. What is Simple Random Sample?
    every possible sample of same size has same chance of being picked
  40. what is stratefied sample?
    divide population into groups and pick randomly from each group
  41. give an example of stratefied sample
    • divide by social economic level and pick households from each level
  42. Describe Cluster Sample and give example
    divide population in groups and pick all members in/or more, but not all of the clusters

    example: everyone in class MTH 222 takes survey
  43. What is systematic Sample? and give example?
    choose a starting value at random the choose kth member of population

    example: line up everyone and then pick every 3rd person
  44. what is convenience?
    most common by just asking...maybe for fun
  45. what is frequency distribution?
    a table shows classes or intervals of data with a count of number of entries in each class
  46. what is range?
    the difference between maximum and minimum number
  47. what is class width?
    distance from lower or upper limits of consecutive classes
  48. what is a dot plot graph?
    plotting dots into graph horizontally
  49. what is a pie chart?
    circle graph that depicts angles and percentages
  50. what is a pareto chart graph?
    separated bar graph that has the highest category to the left and NOT CONTINOUS
  51. what is a scatter plot?
    random scattering of points
  52. what is a time series chart?
    • quantitative entries for a specific amount of time
    • same as line graph and scatter plot
    • *x-axis is a time unit*
  53. what is probability experiment?
    action, trial, which specific results are obtained(counts, measurements, or responses)
  54. what is an outcome?
    result of a SINGLE trial
  55. what is a sample?
    • a set of all possible outcomes
    • outcome is a subset of sample
  56. what is an event?
    • having one or more outcomes
    • also a subset of sample
  57. what is simple event?
    consists of a SINGLE outcome event