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6. Whatdetermineswhethertouseat-distributionoranormaldistribution for finding a confidence interval for μ ?

6. Whatdetermineswhethertouseat-distributionoranormaldistribution for finding a confidence interval for μ ?

math   Statistics-And-Probability   
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Answer #1

So,

t dist is used when population standard deviation is unknown

while

z normal is used when we know the value of population standard deviation

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