Strategies for Program Improvement - Program and Staff Development Department

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Program Evaluation: Strategies for Program Improvement
Recommended Sample Sixes for Two Different Precision Levels

Population Size	Sample Size		Population Size	Sample Size
	+5%	10%		5%	10%
10	10		275	163	74
15	14		300	172	76
20	19		325	180	77
25	24		350	187	78
30	28		375	194	80
35	32		400	201	81
40	36		425	207	82
45	40		450	212	82
50	44		475	218	83
55	48		500	222	83
60	52		1,000	286	91
65	56		2,000	333	95
70	59		3,000	353	97
75	63		4,000	364	98
80	66		5,000	370	98
85	70		6,000	375	98
90	73		7,000	378	99
95	76		8,000	381	99
100	81	51	9,000	383	99
125	96	56	10,000	385	99
150	110	61	15,000	390	99
175	122	64	20,000	392	100
200	134	67	25,000	394	100
225	144	70	50,000	397	100
250	154	72	100,000	398	100

Source: Isaac and Michael, 1981; Smith, M. F., 1983

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University of Arkansas • Division of Agriculture
Cooperative Extension Service
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Little Rock, Arkansas 72204 • USA
Phone (501) 671-2000

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Cooperative Extension Service Departments Program and Staff Development Program Evaluation: Strategies for Program Improvement Recommended Sample Sixes for Two Different Precision Levels

Cooperative Extension Service Departments
Program and Staff Development
Program Evaluation: Strategies for Program Improvement
Recommended Sample Sixes for Two Different Precision Levels