Statistics Adventure

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In that case, you'd still use the z-test! Knowing the variance, even with a small sample size, makes a difference
But what if my pail has less than 30 shells and I know the variance?
But what if my bucket has less than 30 shells and I know the variance?
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If your pail contains more than or equal to 30 and the variance is known or unknown, use the z-test.
How about the Central Limit Theorem? It applies when the sample is ≥ 30 right?
Wait, so if my pail has 30 or more shells, whether I know the variance or not, I still use the Z-test? That’s so much clearer
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Tumpak! But, if your pail contains less than 30 shells and you don't know the variance, then use t-test, okay?
Thanks, Bella! You made stats feel less like a headache. I think I won't drop out anymore HAHAHA!
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Got it! Less than 30 shells and no clue about the variance? Time for the t-test!
In that case, you'd still use the z-test. Knowing the variance, even with a small sample, make a difference.
Yep! As long as you have ≥30 sample, and the variance? Doesn't matter, just go with the z-test.
Anytime, Sheene! Just remember when in doubt, think of your sea shells. Now, let's grab some ice cream before it gets too dark.