Question

Please I need the full answer in less than 1 hour.

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=7 year, S= 1.57 year.

A-For the population mean μ, obtain the two sided confidence interval for 1- α = 0.95. 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.

1-Write the H0 and H1 hypothesis

2-Obtain the calculated value.

3-Show the critical region.

4-What is your decision and conclusion.

Answer 1