Question

5. Grouped frequency distribution tables, frequency distribution polygons, and real limits of intervals Aa A researcher wants to study the academic performance of large primary schools (defined as four or more classrooms 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 level. 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) 86 83 81 76 71 68 64 60 No. School 1 Buckwood Hills Elementary Irving Street Elementary 4 Takoma Canyon Elementary Unity Eementary High Street Elementary Longwood Academy 8 South Central Elementary Wildwood Elementary Central Academy 10 11Wilbur Cross Elementary 12 Metropolitan Community School 13 14 Washington Elementary 15 16 John F. Kennedy Elementary 17 Ukah Township Elementary 18 19 Santa Ana Elementary 20 53 49 47 Anapolis Elementary American Elementary 37 34 Rossmore Academy 30 27 21 15 Gunn Academy

First, the table has approximately 10 (options, class intervals, or interval widths)

The width of each interval is a relatively (wide, simple, or complex) number.

The bottom score in each class interval is a (reflection, multiple, or factor) of the width.

In which interval would a score of 29.6 fall? (20-29, there is no interval for this number, or 30-39)

In which interval would a score of 19.4 fall? (There is no interval for this number, 10-19, or 20-29).

Please don’t forget the graph!

Thanks

Answer 1

1)The table has approximately 10 class intervals

2) The width of each interval is a relatively simple number.

3) The bottom score in each class interval is a multiple of the width

4) The missing values in Table-2 are

For class interval 30-39, Frequency is 5 and relative frequency is 0.20

For class interval 60-69, Frequency is 3 and relative frequency is 0.12

4) The score of 29.6 will be rounded to 30. So it will fall in the interval 30-39.

5) The score of 19.4 will be rounded to 19. So it will fall in the interval 10-19.

6) Graph

4- 0 10 20 30 40 50 60 70 80 90 100 Score