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A sample of 12 joint specimens of a particular type gave a sample mean proportional limit stress of 8.13 MPa and a sample standard deviation of 0.65 MPa.
(a) Calculate the standard error. (Round your answer to four decimal places.)
What is the probability distribution used for critical value?
• Exponential distribution.
• T-distribution.
• Binomial distribution.
• Normal distribution.


Sagot :

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