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Section 5 Freq Distribution For Grouped Data 9.18.09

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Section 5 Freq Distribution For Grouped Data 9.18.09

  1. 1. EDLD 486 STATISTICAL PROCEDURES IN EDUCATION Group #3 Presentation
  2. 2. Frequency Distribution for Grouped Data
  3. 3. Frequency Distribution for Grouped Data
  4. 4. Frequency Distribution for Grouped Data If the data consists of more than 20 scores, place the scores into groups (score intervals) to make it concise.
  5. 5. Frequency Distribution for Grouped Data If the data consists of more than 20 scores, place the scores into groups (score intervals) to make it concise. Interval size:
  6. 6. Frequency Distribution for Grouped Data If the data consists of more than 20 scores, place the scores into groups (score intervals) to make it concise. Interval size: To estimate - subtract lowest score from the highest score (32-10=22 divided by 15 = 1.46)
  7. 7. Frequency Distribution for Grouped Data If the data consists of more than 20 scores, place the scores into groups (score intervals) to make it concise. Interval size: To estimate - subtract lowest score from the highest score (32-10=22 divided by 15 = 1.46) Round UP to next ODD number (easier to plot on graph).
  8. 8. Frequency Distribution for Grouped Data If the data consists of more than 20 scores, place the scores into groups (score intervals) to make it concise. Interval size: To estimate - subtract lowest score from the highest score (32-10=22 divided by 15 = 1.46) Round UP to next ODD number (easier to plot on graph). Tally each score individually (instead of counting the number of scores in each interval - takes too much time and errors occur!
  9. 9. Frequency Distribution for Grouped Data If the data consists of more than 20 scores, place the scores into groups (score intervals) to make it concise. Interval size: To estimate - subtract lowest score from the highest score (32-10=22 divided by 15 = 1.46) Round UP to next ODD number (easier to plot on graph). Tally each score individually (instead of counting the number of scores in each interval - takes too much time and errors occur! Start with lowest score and work up to highest score.
  10. 10. Frequency Distribution for Grouped Data If the data consists of more than 20 scores, place the scores into groups (score intervals) to make it concise. Interval size: To estimate - subtract lowest score from the highest score (32-10=22 divided by 15 = 1.46) Round UP to next ODD number (easier to plot on graph). Tally each score individually (instead of counting the number of scores in each interval - takes too much time and errors occur! Start with lowest score and work up to highest score. The sum of frequencies - total # of scores
  11. 11. Frequency Distribution of Ages for Cousins 32, 30, 29, 27, 29, 28, 25, 23, 28, 26, 24, 10, 27, 25, 23, 21, 19, 15, 11, 29, 27, 25, 23, 31, 29, 27, 24, 29, 27, 24, 21, 21, 19, 18, 18, 16
  12. 12. X tally marks f 31-33 ll 28-30 llllllll 25-27 lllllllll 22-24 llllll 19-21 lllll 16-18 lll 13-15 l 10-12 ll 36
  13. 13. X tally marks f 31-33 ll 28-30 llllllll 25-27 lllllllll 22-24 llllll 19-21 lllll 16-18 lll 13-15 l 10-12 ll 36
  14. 14. Table 1 Frequency Distribution of Ages of Cousins X tally marks f 31-33 ll 2 28-30 llllllll 8 25-27 lllllllll 9 22-24 llllll 6 19-21 lllll 5 16-18 lll 3 13-15 l 1 10-12 ll 2 sum of 36 f=36
  15. 15. • Percentages - easier to interpret data. • f (3) divided by sum (f) = ___ x 100 = ___ = ____%
  16. 16. • Percentages - easier to interpret data. • f (3) divided by sum (f) = ___ x 100 = ___ = ____% X tally f P 31-33 marks ll 2 5.55% 28-30 llllllll 8 22.22% 25-27 lllllllll 9 25% 22-24 llllll 6 16.66% 19-21 lllll 5 13.88% 16-18 lll 3 8.33% 13-15 l 1 2.77% 10-12 ll 2 5.55% sum of 36 f=36 99.6%
  17. 17. Table 1 Frequency Distribution of Ages of Cousins X f P 31-33 2 5.55% 28-30 8 22.22% 25-27 9 25% 22-24 6 16.66% 19-21 5 13.88% 16-18 3 8.33% 13-15 1 2.77% 10-12 2 5.55% sum of 99.6% f=36

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