Introduction
The null hypothesis is wrong since the two group means are not equal. The monthly mean returns for the Democratic Party group is greater than that for the Republican Party. Therefore, Democratic Party is best for the investors. Since 1926, American stock market has essentially experienced gains of 300 percent. However, the net gain under the Republican administrations has been zero percent during a similar period. This implies that a person who started to invest in the stock market in 1926 with 10,000 US dollars during the administrations of both political parties would have earned 11,733 U.S dollars under ...