What is the relationship between percentiles and quartiles? Interpret Q1, Q2, & Q3 as percentiles. (Hint: A number xx is at the kthkth percentile if k%k% of the data in the set is less than or equal to xx .) [3]

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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ISBN:9780079039897
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Chapter4: Equations Of Linear Functions
Section4.5: Correlation And Causation
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  1. What is the relationship between percentiles and quartiles? Interpret Q1, Q2, & Q3 as percentiles. (Hint: A number xx is at the kthkth percentile if k%k% of the data in the set is less than or equal to xx .) [3]
  2. What can you say about a data set when the “box” in the box plot is very wide but the “whiskers” do not go out very far from the box? [2]
  3. Why is it important to identify outliers?
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Percentiles are 99 points that divide any data set or distribution into 100 equal parts. These are denoted as P1, P2, …P99. this means that 1% of the observations, 2% of the observations,….99% of the observations are but or up to P1, P2,…P99 respectively. Quartiles Q1, Q2, Q3 are 3 points that divide the distribution into 4 equal parts. 

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