You can use the t-value as test statistic when the sample size is large sample size...

 

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You can use the t-value as test statistic when the sample size is large sample size is small and population standard deviation is unknown sample size is small or population standard deviation is unknown population standard deviation is unknown You can use the t-value as test statistic when the sample size is large sample size is small and population standard deviation is unknown sample size is small or population standard deviation is unknown population standard deviation is unknown