Confidence interval for variance-need ur help-exam after 2 days
Confidence interval for variance
In 16 test runs the gasoline consumption of an experimental engine had a slandered deviation of 2.2 gallons. Find 99% confidence intervals for variance , which measures the true variability of the gasoline consumption of the engine.
Solve it using this rule:
I don't know how to calculate x^2 alpha/2,n-1
2.21< < 15.78