8. NHI Goals Scored. Between 2003 and 2014, the National Hockey League endured two lockout seasons and underwent a number of rules changes. Did this affect the number of goals scored? The following table shows the mean goals scored per game for a random sample of five NHL teams for the 2003-2004 and the 2013-2014 seasons. Test whether the population median of the difference in mean number of goals scored per game is greater than zero, using level of significance .