Why does z-test is being used when the sample size is large(> 30) and t-test when the sample size is small(< 30)?

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A: Note : As per guidelines we are supposed to solve only three sub parts. please repost the other part…

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Q: nple size = 120 5. Claimed proportion = 0.7, Sample proportion = 0.68, sample size = 30

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Q: Hi can u help with question E please?

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A: As per company guidelines I solved exactly three subparts of the question.

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Q: Find the area and normal curve Greater than z = -0.78

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Q: can you give me some example in your own problem about this?  Test on means for two sample

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Q: Can you give the statistical table you have used to get the 1.96? Thank you.

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