In an experiment to determine the effect of ambient temperature on the emissions of oxides of nitrogen (NOx) of diesel trucks, 10 trucks were run at temperatures of 40°F and 80°F. The emissions, in parts per billion, are presented in the following table.

Can you conclude that the mean emissions are higher at 40°F?

a. State the null and alternate hypotheses.

b. Compute the test statistic.

c. State a conclusion. Use the α = 0.05 level of significance.

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Truck 40F 80F 1 834.7 815.2 2 753.2 765.2 34567 855.7 842.6 901.2 797.1 785.4 764.3 862.9 819.5 882.7 783.6 8 740.3 694.5 9 748.0 772.9 10 848.6 794.7