To determine how american college students feel about commuting, 100 students at a private university were randomly chosen by selecting 50 men and 50 women to participate. they were asked how far they commute each day (in minutes) to campus. the results of this survey are unreliable primarily because of

The outcomes of this investigation are unreliable mainly because of sampling bias. In statistics, sampling bias is a bias in which a sample is composed in such a method that more or less members of the envisioned population are less probable to be encompassed than others.

the correct answer is modern american cars are not available due to trade restrictions.

trade between cuba and the united states have serious restrictions. the u.s. imposed an economic embargo on cuba, that among other things means that modern american cars are not available due to trade restrictions.

in response to some governmental actions of the authorities from cuba, president john f. kennedy proclaimed an embargo on trade between both countries in february 1962. the trade embargo remains active until this day and was implemented directly by the departments of commerce and the department of treasury.

in president trump’s administration, there is a national security presidential memorandum that "strengthens the policy of the u. s.", affecting trade with cuba.