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Sample size

LN Lenka Navrátilová
JV Jozef Výbošťok
ZD Zuzana Dobšinská
JŠ Jaroslav Šálka
MP Magdaléna Pichlerová
VP Viliam Pichler
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The intention was to carry out the survey on a representative sample of respondents. The population size for each stratum was known; therefore, the sample size for each stratum was determined using formula [1] according to Krejcie and Morgan (1970):

where n is the required sample size, x is the table value of Chi-square for 1 degree of freedom at the expected confidence level (1.645), N is the population size, P is the population proportion (0.5), and d is the degree of accuracy expressed as a proportion (0.10).

The required sample size and the real sample size are shown in Table 1. The real sample size reaches in most cases the required sample size, except for the group of respondents over 61 years old, for which the margin of error is 14.32% instead of the required 5%.

Determination of sample size

ahttp://statdat.statistics.sk

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