Two types of instruments for measuring the amount of sulfur monoxide in the atmosphere are compared in an air-pollution experiment. It is desired to determine whether the two types of instrument yield...





Two types of instruments for measuring the amount of sulfur monoxide in the atmosphere are compared in an air-pollution experiment. It is desired to determine whether the two types of instrument yield the equal mean measurement. The following readings were recorded for the two instruments:




































Sulfur Monoxide



Instrument A



0.96



0.82



0.75



0.61



0.89



0.64



0.81



0.68



0.65



Instrument B



0.87



0.74



0.63



0.55



0.75



0.70



0.69



0.57



0.53





  1. Construct 90% confidence interval for the ratio of standard deviations of measurements of the two instruments.

  2. Depending upon the answer to part (a), construct 95% confidence interval for the difference between the mean measurements of the two instruments and interpret your answer. Assume the measurements are approximately normally distributed.

  3. Do the mean measurements of the two instruments differ?



Jun 01, 2022
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