You measure the lifetime of a random sample of 64 tires of a certain brand. Suppose that the lifetimes for tires of this brand follow a normal distribution, with unknown mean μ and standard deviation σ = 5 kg. What is the 99% confidence interval?
1 Answer
Apr 7, 2017
Population mean lies in between
Explanation:
let the Sample mean be
Sample Standard Deviation
Sample size
Then -
Standard Error
Population Mean
#mu=barx+-(zxxSE)#
#mu=barx+-(2.58xx0.625)#
#mu=barx+-1.6125#
Population mean lies in between