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Ex2) The following data represent the top 25 ranked college by SAT scores (out of 2400)

(a) Construct a frequency, relative frequency distribution, and cumulative relative frequency of data (5 classes).

asked Jan 31, 2015 in STATISTICS by doan12345 Pupil
reshown Jan 31, 2015 by goushi

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Step 1:

The smallest number in data set is .

The largest number in data set is .

Range =

The range

Class limit

Sample size

Step 2:

answered Jan 31, 2015 by david Expert
edited Jan 31, 2015 by bradely

I need wth the question below

asked Jan 31, 2015 in STATISTICS by doan12345 Pupil

How did you find the class width?

commented Feb 1, 2015 by doan12345 Pupil

For the class width I got

1435-1456

1457-1478

1479-1503

1504-1522

1523-1544

commented Feb 1, 2015 by doan12345 Pupil

Find the first class limit by adding class width to lowest value.

1435 + 22 = 1457

Second class limit :

1458 + 22 = 1480.

The classes must be equal in width.

If you consider class limits :

1435 - 1456

1457 - 1478

1479 - 1503

1504 - 1522

1523 - 1544

The classes are not equal in width.

Find the width of classes.

First class limit 1435-1456.

width = 1456 - 1435 = 21

Third class limit 1479 - 1503.

width = 1503 - 1479 = 24.

In this case class width is not equal, so we don't consider the above class limits.

commented Feb 2, 2015 by david Expert
edited Feb 2, 2015 by bradely

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