Optimum sample size for yield estimation in certain commercial flower crops

Using data on yield of eight commercial floriculture crops viz. rose, China aster, chrysanthemum, gladiolus, marigold, tuberose, gerbera and carnation; optimum sample sizes were worked out for 95 and 99% of confidence for an interval not exceeding 5 and 10% of the mean. It was observed that there existed a wide variation of the optimum sample size between years. For normally acceptable level of 95% and the sample mean falling within 10% of the actual mean, a maximum of 20% of plants in rose, 54% in China aster, 21% in chrysanthemum, 17% in gladiolus, 11% in African marigold, 40% in tuberose (Single) 7% in gerbera, and 11% in carnation, are to be sampled to get better estimates.