Z Test 1 Test of significance of single mean
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Question: A random sample of 400 flowers tins has average length of 10 cm. Can this be regarded a sample from large population with mean of 10.2 cm and standard deviation of 2.25 cm?
When to use 'Z' Test? When to use 't' Test? How to use 'Z' Test, when the information regarding a large sample is available and the population standard deviation is known? - The answer is in this lecture.
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