Refer to Exercise 12.

Assume you did not know that the two samples were paired, so you used the methods of Section 11.1 to perform the test.

a. What is the P-value?

b. Explain why the P-value is greater when the methods of Section 11.1 are used.

Exercise 12

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?

Transcribed Image Text:

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