Confidence intervals
I know that we use a t-distribution when sample size is small (n<30) and when sigma is unknown, but in instances where both the population distribution is unknown (i.e. we dont know if the population is normal) and sigma is unknown, and n is large (e.g. n=60) what method do we use in terms of calculating the intervals?
Would appreciate a bit of clarification. Thanks.
Would appreciate a bit of clarification. Thanks.
Or is it even possible to determine the interval with the circumstances above?
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