Aa Aa 5. Grouped frequency distribution tables, frequency distribution polygons,

Question

Aa Aa 5. Grouped frequency distribution tables, frequency distribution polygons, and real limits of intervals A researcher wants to study the academic performance of small primary schools (defined as one classroom per grade) in her county. She decides to measure each school's academic performance by collecting data on the percentage of students performing at or above grade levell The following table shows each school with the percentage of students performing at or above grade level. Table 1 Academic Performance (Percentage of students performing at or above grade level) 82 74 63 60 57 No. School 1 Buckwood Hills Elementary 2 Community Elementary Irving Street Elementary 4 Takoma Canyon Elementary Unity Elementary High Street Elementary Longwood Academy 51 48 45 42 39 38 36 32 30 27 24 21 18 15 12 8 South Central Elementary 9 10 Wildwood Elementary Central Academy Wilbur Cross Elementary 12 Metropolitan Community School 13 14 15 16 John F. Kennedy Elementary 17 Ukiah Township Elementary 18 19 20 21 Anapolis Elementary Washington Elementary American Elementary Rossmore Academy Santa Ana Elementary Gunn Academy Monroe Elementary

Explanation / Answer

From the given data

The table has approximately 10 is width of CI.
The width of each interval is a relatively frequency number. The bottom score in each CI is a 10 of the width

59.6 fall ---> 60 - 69 class
49.4 fall ---> 40 - 49 class

Class Interval Relitive LL UL f freq 0 9 2 0.08 10 19 5 0.2 20 29 3 0.12 30 39 5 0.2 40 49 3 0.12 50 59 3 0.12 60 69 2 0.08 70 79 1 0.04 80 89 1 0.04 Total = 25

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