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As we change sample unit size how does this impact variance (spread)?

As we change sample unit size how does this impact variance (spread)?

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As we change sample unit size how does this impact variance (spread) :

As the sample unit size increases, the standard deviation of the means decreases; and as the sample size decreases, the standard deviation of the sample means increases.

i.e. A  sample unit size increases, sample variance (variation between observations) increases but the variance of the sample mean (standard error) decreases.

which is correct impact of variance by change sample unit size.

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