FORESTRY
AGRICULTURAL STATISTICS AND ECONOMICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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z procedures
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Pythagorean Theorem
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t procedures
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np > 10 and n(1-p) > 10
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Detailed explanation-1: -A hypothesis test for a population mean when the population standard deviation, , is unknown is conducted in the same way as if the population standard deviation is known. The only difference is that the t-distribution is invoked, instead of the standard normal distribution (z-distribution).
Detailed explanation-2: -Since the population standard deviation is unknown and the sample size n=20 n = 20 is less than 30, the researcher should use a t-test.
Detailed explanation-3: -However, now when we do not know the population standard deviation, we will use the t-distribution. As the sample size, increases the t distribution approaches the standard normal distribution. then the t-scores follow a Student’s t-distribution with n–1 degrees of freedom.