Question

Here is a data set: 15200 23700 15100 8600 20000 10600 7600 11600 12300 13100 17400 9300 11400 16800 15700 14700 19100 16400 12200 12200 9100 14000 13600 15100 4500 11700 6100 15700 The goal is to construct a grouped frequency distribution table (GFDT) for this data set. The GFDT should have 10 classes with a "nice" class width. Each class should contain its lower class limit, and the lower class limits should all be multiples of the class width. This problem is to determine what the class width and the first lower class limit should be. What is the best class width for this data set? optimal class width = What should be the first lower class limit? 1st lower class limit =

Answer 1

optimal class width = 2000

1st lower class limit = 4000

lower		upper	midpoint	width	frequency
4,000	<	5,999.99	5,000	2,000	1
6,000	<	7,999.99	7,000	2,000	2
8,000	<	9,999.99	9,000	2,000	3
10,000	<	11,999.99	11,000	2,000	4
12,000	<	13,999.99	13,000	2,000	5
14,000	<	15,999.99	15,000	2,000	7
16,000	<	17,999.99	17,000	2,000	3
18,000	<	19,999.99	19,000	2,000	1
20,000	<	21,999.99	21,000	2,000	1
22,000	<	23,999.99	23,000	2,000	1
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