Reading
Chi-Square Test for the Variance (NIST) - https://www.itl.nist.gov/div898/handbook/eda/section3/eda358.htm
Chi Squared Test for Variance or Standard Deviation (University of Saskatchewan ) - https://openpress.usask.ca/introtoappliedstatsforpsych/chapter/9-5-chi-squared-test-for-variance-or-standard-deviation/
Chi-Square Test for the Variance or Standard Deviation (California State University, Fresno) - http://zimmer.csufresno.edu/~lburger/Math%20137_chisq_var.pdf