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Max’s 2 – year checkup

Max’s 2 – year checkup. What does that even mean , Dad?. Weight 8o th percentile (also written as P 80 ) Length 90 th percentile (or P 90 ) Head Girth 85 th percentile (or P 85 ) . Weights of 100 randomly selected 2 year old white American males (in pounds) .

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Max’s 2 – year checkup

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  1. Max’s 2 – year checkup

  2. What does that even mean, Dad? Weight 8oth percentile (also written as P80) Length 90th percentile (or P90) Head Girth 85th percentile (or P85)

  3. Weights of 100 randomly selected 2 year old white American males (in pounds)

  4. Weights of 100 randomly selected 2 year old white American males (in pounds)

  5. Tell me everything you can aboutthe weights of these 2 – year olds...

  6. So...what’s with Max’s “80th Percentile”?

  7. How many of these 2 – year olds weigh less than 26 pounds?

  8. How many of these 2 – year olds weigh less than 29 pounds?

  9. How many of these 2 – year olds weigh less than 31 pounds?

  10. So, Max is in the 80th percentile for his weight, because, at 31 pounds, he weighs more than 80% of 2 – year old boys. In general, a percentile (or percentile rank) is the proportion of data that a given point exceeds. However...

  11. It might be easier to see the percentiles with the a cumulative frequency histogram...

  12. ...or an ogive.

  13. An ogive you might see one day (or maybe already have!)

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