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DarkendSinz30

Construct both an ungrouped and a grouped frequency distribution for the data given below: 124 115 111 112 118 123 121 116 114 113 118 110 110 112 116 118 120 115 120 110

  • one year ago
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  1. DarkendSinz30
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    I know I have to organize them from least to greatest right?

    • one year ago
  2. sirm3d
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    yes. for the grouped frequency distribution, how many intervals are needed?

    • one year ago
  3. DarkendSinz30
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    110,110,110,111,112,112,113,114,115,115,116,116,118,118,118,120,121,123,124

    • one year ago
  4. DarkendSinz30
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    I am going to say 4?

    • one year ago
  5. sirm3d
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    |dw:1354405916219:dw|

    • one year ago
  6. sirm3d
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    is there any formula for this number of intervals?

    • one year ago
  7. DarkendSinz30
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    I don't follow if there is I can't remember what the formula is?

    • one year ago
  8. sirm3d
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    the general rule is to use not too few and not too many intervals. so 4 is okay me.

    • one year ago
  9. sirm3d
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    just make sure that the low interval must include 110 and the high interval must include 124. also, equal intervals are preferred over unequal intervals, particularly to ratio type of data.

    • one year ago
  10. DarkendSinz30
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    |dw:1354406677376:dw|

    • one year ago
  11. DarkendSinz30
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    does that look right?

    • one year ago
  12. sirm3d
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    nope. the sizes are different. try 110-113, 114-117,118-121, 122-125

    • one year ago
  13. DarkendSinz30
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    okay it will be the numbers though right?

    • one year ago
  14. DarkendSinz30
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    X F ----------------- 110 - 113 7 114 - 117 5 118 - 121 5 122 - 125 2

    • one year ago
  15. DarkendSinz30
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    That looks better

    • one year ago
  16. sirm3d
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    =)

    • one year ago
  17. sirm3d
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    there are 20 data points in your given, but you only have a total of 19 in your grouped frequency distribution.

    • one year ago
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