A congressional committee wishes to examine the effect of pr

A congressional committee wishes to examine the effect of proposed legislation on the nation\'s high schools. It randomly selects 5 high schools from the 20 in the Washington D.C. area and conducts a study on those 5 schools. Has the committee obtained a random sample of the nation\'s high schools?

Solution

No, this is not a random sample of the whole nation because just schools from the DC area were sampled. A random sample of all the schools in the country needs to be taken in order to apply any conclusions to the whole nation.