The salmon fisheries support a primary industry in Alaska and their management is of high priority. Salmon are born in freshwater rivers and streams but then swim out into the ocean for a few years before returning to spawn and die. In order to identify the origins of mature fish, researchers studied growth rings on their scales. The growth the first year in freshwater is measured by the width of the growth rings for that period of life. The growth ring for the first year in the ocean environment will give an indication of growth for that period. A set of these measurements are given in Table D.7 in the Data Bank.
(a) Describe the freshwater growth for males by making a histogram and calculating the mean, standard deviation, and quartiles.
(b) Describe the freshwater growth for females by making a histogram and calculating the mean, standard deviation, and quartiles.
(c) Construct boxplots to compare the growth of males and females.