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Answer
We know that student's t statistic is completely acceptable for symmetric data
we can use student's t statistic for sample size less than 6 as well as for sample size greater than 1000. but we make sure that the population parameters are unknown.
we can use student's t statistic for any sample size, we just need unknown population parameter in order to use student's t statistic.
When the data is very skewed, then it is not useful to use student's t statistic because student's t statistic is not able to find out any significant in case of very skewed data
so, option D is answer
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