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Which is an example of a minimum sample size?
Take the example discussed above where the the minimum sample size is computed to be \\(N\\) = 9. This estimate is low.
Is there a minimum sample size required for the t-test to?
He said it should’ve been at least 40 respondents. There is no minimum sample size for the t test to be valid other than it be large enough to calculate the test statistic. Validity requires that the assumptions for the test statistic hold approximately.
What is the minimum sample size for a 95% confidence interval?
For a 95% confidence interval, z ∗ = 1.960 This is the minimum sample size, therefore we should round up to 601. In order to construct a 95% confidence interval with a margin of error of 4%, we should obtain a sample of at least n = 601. We want to construct a 95% confidence interval for p with a margin of error equal to 4%.
Is there a sample size calculator for Statistics?
This calculator computes the minimum number of necessary samples to meet the desired statistical constraints. Leave blank if unlimited population size. This calculator gives out the margin of error or confidence interval of an observation or survey.
How are sample sizes calculated when standard deviation is not known?
The procedures for computing sample sizes when the standard deviation is not known are similar to, but more complex, than when the standard deviation is known.
Can a variance be greater than the maximum?
2 Answers. Even for IID Bernoulli random variables, the variance of any order statistic other than the median can be greater than the variance of the population. For example, if is with probability and with probability and , then the maximum is with probability , so the variance of the population is while the variance of the maximum is about .
Which is the best bound for a random variable?
For any n random variables X i , the best general bound is V a r ( max X i) ≤ ∑ i V a r ( X i) as stated in the original question. Here is a proof sketch: If X,Y are IID then E [ ( X − Y) 2] = 2 V a r ( X).