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1. Two types of instruments for measuring the amount of sulfur monoxide in the atmosphere are being compared in an air-pollution experiment. Researchers wish to determine whether the two types of instruments yield measurements having the same variability. The readings were recorded for the two instruments. Assuming the populations of measurements to be approximately normally distributed, test the hypothesis that _A^2=_B^2 against _A^2_B^2 at a level of significance =0.05. Does this mean that one instrument is more reliable than the other? Or are they equally accurate?

Sulfur Monoxide Instrument A Instrument B 0.86 0.87 0.82 0.74 0.75 0.63 0.61 0.55 0.89 0.76 0.64 0.70 0.81 0.69 0.68 0.57 0.65 0.53