In an opinion survey on a particular political referendum, ?fteen randomly samples individuals were asked to give their individual opinions using the following options:

1= Strongly agree; 2 = Agree; 3 = Indifferent; 4 = Disagree; 5 = Strongly disagree. The result is the data set, S15.

S15 = {1, 4, 5, 3, 2, 3, 3, 2, 2, 2, 1, 3, 3, 3, 3}

Carry out a one-sample sign test to con?rm or refute the allegation that the population from which the 15 respondents were sampled has a median of people that are indifferent to the referendum in question.