Hypothesis Testing Sigma Known Two Tailed P-Value Method

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This is a video on hypothesis testing a mean sigma is known. This is a two tailed test.
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LIFE SAVER, thank you. Keep it coming!!

bigpappi
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Wow, you're a great explainer and teacher. Than you so much!

sillabaez
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I still confused, why you use z test(not t-test) because i recognized the n is less than 30.

vincentiusharyanto
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Genuine question. Why is the z-table used here instead of t-table? Shouldn't we use the latter if population standard deviation is known but sample size is less than 30?

qwertytwerqy
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I think you might have used the wrong a value. The question mentioned a= .01, but you used .02 in the table

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