ISSN:
1432-2242
Keywords:
Sugarcane
;
Sample Size
;
Population
;
Variance
;
Polycross
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary An approximate method to determine sample size for the estimation of population variance, σ2, is given. The estimate of σ2 is denoted as s2 . Based on the assumption of a normal distribution for (s2/σ2−1), the sample size is approximately equal to 20,000 z2 p,/k2; where z is a standard normal deviate, p is the probability that Δs2 (≡ 100¦s2 − σ2¦/σ2) is less than, or equal to, a critical value k, and k (measured as gDs2) is the desired precision of s2 . The expected value of Δs2, with respect to sample size, and the expected cumulative frequencies of Δs2 over sample size for various k values are given. Their goodness of fit to the observed results was satisfactory except for populations that were different from normal. The observed values were taken from a study on four yield components in five sugarcane polycross progenies, grown in two contrasting environments over 2 years in three selection stages. The expected Δs2 was found to be independent of the population coefficient of variance.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00306059
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