Engineers at an oil refinery find out how easily gasoline evaporates by measuring its vapor pressure. as they make gasoline, they need to determine whether its vapor pressure is high enough. the standard deviation of the vapor pressure of the gasoline made by the refinery is always 0.03 (pounds per square inch). which hypothesis test would be most appropriate for this task?
question options:
a. one sample z-test
b. one sample t-test
c. paired-samples t-test
d. two sample t-test

Acompany manufactures large valves, packed in boxes. a shipment consists of 1500 valves packed in 75 boxes. each box has the outer dimensions 1.2 x 0.8 x 1.6 m and the inner dimensions 1.19 x 0.79 x 1.59 m. the boxes are loaded on a vehicle (truck + trailer). the available capacity in the vehicle combination is 140 m3. each valve has a volume of 0.06 m3. - calculate the load factor on the box level (%). - calculate the load factor on the vehicle level (%). - calculate the overall load factor (%).