Have goals been easier to score in the NHL in some eras than others? Many of us have heard of hockey greats such as Maurice "Rocket" Richard, Gordie Howe, Wayne Gretzky, and Mario Lemieux. But have you heard of Bill Cook, who scored 28 goals in 48 games for the New York Rangers in 1933, or Norm Ullman, who scored 42 in 70 games for the Toronto Maple Leafs in 1965? The average number of goals per game for the NHL's leading goal scorers are given on the text website. They begin in 1931 with Charlie Conacher, who averaged 0.70 goals per game when he played with the Toronto Maple Leafs.

The last entry is for the year 2006, when Jonathan Cheechoo of the San Jose Sharks averaged 0.68 goals per game. The data is divided into three different eras that hockey followers believe exhibit different goal scoring patterns: 1933-1967, 1968-1993, and 1994-2006. How can we summarize the information in this data set? 1. Use MINITAB or Excel to describe the goals per game for the leading goal scor- ers in each of the three different eras. Generate any graphics that may help you in interpreting these data sets. 2. Do the eras appear to differ in their levels of scoring? Do the goals per game appear to be more variable in some eras than others? 3. Are there outliers in any of the eras? 4. Summarize your comparison of the three hockey eras.