Answer:
The 95% confidence interval for the true mean resale value of a 5-year-old car of this model
(11,688.68 , 12,511.32)
Step-by-step explanation:
<u><em>Step(i)</em></u>:-
Given sample size 'n' = 17
mean of the sample x⁻ = 12,100
Standard deviation of the sample (S) = 800
The 95% confidence interval for the true mean resale value of a 5-year-old car of this model
<u><em>Step(ii):-</em></u>
<u><em>Degrees of freedom ν =n-1 = 17-1 =16</em></u>
<u><em></em></u><u><em></em></u>
The 95% confidence interval for the true mean resale value of a 5-year-old car of this model
(12,100 - 411.32 , 12,100 + 411.32)
(11,688.68 , 12,511.32)