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DarkendSinz30

  • 2 years ago

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

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

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

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

  4. DarkendSinz30
    • 2 years ago
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    I am going to say 4?

  5. sirm3d
    • 2 years ago
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    |dw:1354405916219:dw|

  6. sirm3d
    • 2 years ago
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    is there any formula for this number of intervals?

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

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

  9. sirm3d
    • 2 years ago
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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.

  10. DarkendSinz30
    • 2 years ago
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    |dw:1354406677376:dw|

  11. DarkendSinz30
    • 2 years ago
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    does that look right?

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

  13. DarkendSinz30
    • 2 years ago
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    okay it will be the numbers though right?

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

  15. DarkendSinz30
    • 2 years ago
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    That looks better

  16. sirm3d
    • 2 years ago
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    =)

  17. sirm3d
    • 2 years ago
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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.

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