The percentage of titanium in an alloy used in aerospace castings is measured in 51 randomly selected parts. the sample standard deviation is s = 0.46. construct a 95% two-sided confidence interval for σ. assume population is approximately normally distributed.

Step-by-step explanation:

Given : sample size : n= 51

sample standard deviation : s= 0.46

Significance level :

Using chi-square distribution, the critical values will be :

Confidence interval for population standard deviation () :

Substitute all the values , we get

Hence, the 95% two-sided confidence interval for σ :

step-by-step explanation:

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