Question

An experimenter wanted to check the variability of measurements ob- tained by using equipment designed to measure the volume of an audio source. Three independent measurements recorded by this equipment for the same sound were 4.1, 5.2, and 10.2. Estimate the confidence interval for σ2 at confidence level 1 − α = 0.9.

please don’t use any software to solve this

Answer 1

solution: BY USING THE EXCEL, A 99% confidence interval estimate to the variance volumue of an audio source is   IN EXCEL SHEET 1) Import the data 2) select the MEGASTAT from ADD-INS mean 3) select MEAN vs HYPOTHESIZED Value from hypothesis test    4) enter SUMMARY INPUT and HYPOTHESIZED MEAN 5) select t-test, Alternative and confidence level 6) click ok CHI-SQUARE VARIANCE TEST _{10.5700 OSERVED VARIANCE OF VOLUME 3 n 2 df 1.9950 confidence interval 99% lower 2,108.7160 confidence interval 99% upper from the excel out put, a 99% confidence interval estimate to the variance volume of an audio sources is 2.00 to 2018.71 please give me like , thank you}