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# Aqa s2 help

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1. If I know the variance and the sample size is less than 30 would I use t tables or z?
2. (Original post by Hjyu1)
If I know the variance and the sample size is less than 30 would I use t tables or z?
Usually the CLT is applicable for - so you'd use t-tables.
3. (Original post by Zacken)
Usually the CLT is applicable for - so you'd use t-tables.
Is that assuming the population is normally distributed or not
4. (Original post by Hjyu1)
Is that assuming the population is normally distributed or not
Yes.

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