18. Ten couples are participating in a small study on cholesterol. Neither the man nor the woman in each couple is known to have any problems with high cholesterol. The researcher conducting the study wishes to determine if there is evidence that the cholesterol level for the husband tends to be higher than the cholesterol level for the wife.

What would be the appropriate hypotheses to answer this researcher's question?

Group of answer choices

H0:husbandwife=0vsHa:husbandwife>0

H0:xhusbandxwife=0vsHa:xhusbandxwife>0

H0:xhusbandxwife=0vsHa:xhusbandxwife<0

H0:husbandwife=0vsHa:husbandwife<0