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Gemiddelde kwadratische afwijking
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### Enkele testen ###
data <- c(98, 97, 98, 99, 100, 98)
var_steekproef(data) # 1.0667
sd_steekproef(data) # 1.0328
data <- c(14, 25, 14, 18, 16, 16, 20)
var_steekproef(data) # 15.2857
sd_steekproef(data) # 3.9097
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