Sample size for estimating mean and coefficient of variation in species of crotalarias

Sample size for estimating mean and coefficient of variation in species of crotalarias

The objective of this study was to determine the sample size necessary to estimate the mean and coefficient of variation in four species of crotalarias (C. juncea, C. spectabilis, C. breviflora and C. ochroleuca). An experiment was carried out for each species during the season 2014/15. At harvest,...

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Bibliographic Details
Published in:Anais da Academia Brasileira de Ciências Vol. 90; no. 2; pp. 1705 - 1715
Main Authors: Toebe, Marcos, Machado, Letícia N, Tartaglia, Francieli L, Carvalho, Juliana O DE, Bandeira, Cirineu T, Cargnelutti Filho, Alberto
Format: Journal Article
Language:English
Published: Brazil Academia Brasileira de Ciências 01-04-2018
Subjects:
Biological Variation, Population
Crotalaria - anatomy & histology
Crotalaria sp
Data Interpretation, Statistical
experimental precision
Fruit - standards
MULTIDISCIPLINARY SCIENCES
number of pods
resampling
Sample Size
Sampling Studies
Seeds - anatomy & histology
Statistics as Topic - standards
number of pods
Crotalaria sp
resampling
experimental precision
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Summary:The objective of this study was to determine the sample size necessary to estimate the mean and coefficient of variation in four species of crotalarias (C. juncea, C. spectabilis, C. breviflora and C. ochroleuca). An experiment was carried out for each species during the season 2014/15. At harvest, 1,000 pods of each species were randomly collected. In each pod were measured: mass of pod with and without seeds, length, width and height of pods, number and mass of seeds per pod, and mass of hundred seeds. Measures of central tendency, variability and distribution were calculated, and the normality was verified. The sample size necessary to estimate the mean and coefficient of variation with amplitudes of the confidence interval of 95% (ACI95%) of 2%, 4%, ..., 20% was determined by resampling with replacement. The sample size varies among species and characters, being necessary a larger sample size to estimate the mean in relation of the necessary for the coefficient of variation.
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content type line 23
ISSN:0001-3765
1678-2690
1678-2690
DOI:10.1590/0001-3765201820170813