Among 4,000 individuals sampled randomly from men whose heights are normally distributed with mean 170 cm and standard deviation 7.5 cm, how many men will be between 177.5 cm and 155 cm.
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8jy4eeY8tatAmong 4,000 individuals sampled randomly from men whose heights are normally distributed with mean 170 cm and standard deviation 7.5 cm, how many men will be between 177.5 cm and 155 cm.
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It's because of the Central Limit Theorem which justifies the use of normal distribution if the sample size is large enough. ... You will always get something around 30 as a minimum sample size “that is needed to estimate the true population proportion with the required margin of error and confidence level”(cite).
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