@pagal_guy wrote:
hello,
While learning about hypothesis testing it seems that we can use the t-test in place of z - test when the population variance is unknown.
But in real life I think we hardly know the population variances and if the sample size is large enough(>= 30) we can use the z-test even if sigma is unknown by replacing it with the sample std dev.Is this correct or am I missing something here??
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