Two types of instruments for measuring the amount of sulfur monoxide in the atmosphere are being compared in an air-pollution experiment. The following readings were recorded daily for a period of 2 weeks. Using the normal approximation to the binomial distribution, perform a sign test to determine whether the different instruments lead to different results. Use a 0.05 level ofsignificance.

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Sulfur Monoxide Day Instrument A Instrument B 0.96 0.87 0.74 0.82 2 3 0.75 0.63 0.61 0.55 4 0.89 0.76 0.70 6. 0.64 0.81 0.69 0.68 0.57 0.53 0.65 10 11 0.84 0.88 0.59 0.51 0.79 12 0.94 13 0.91 0.84 14 0.77 0.63