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Need help with part c. Please leave detailed explanation with steps please and thank you ? might she have done De 6.20 A curing process

Need help with part c. Please leave detailed explanation with steps please and thank you ?

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might she have done De 6.20 A curing process for cement results in a mean compressive strength of 5000 kg per cm with standard deviation 120 kg per cm". A new curing process is proposed, and a random sample of 50 pieces of cement is tested To test Ho : u - 5000 versus H1 : u

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