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Question: In a faculty of dentistry, the average durability of dental fillings made using a particular...

Question: In a faculty of dentistry, the average durability of dental fillings made using
a particular medication by the assistant as a dissertation. The n = 25 dental fillings made
using the medication are selected randomly and the sample mean and the sample standard
deviation are calculated as; x=6 year, S= 2.73 year.
A-For the population mean μ, obtain the two sided confidence interval for 1- α = 0.9. Explain which case you use.

B-The assistant claim that, the average durability of the dental fillings is different from the μ0 = 15 year test the hypothesis.

C-Write the H0 and H1 hypothesis

D-Obtain the calculated value.

E-Show the critical region.

F-What is your decision and conclusion.

Math   Statistics-And-Probability   
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Answer #1

Given that

Sample size =n= 25

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