Ring Lardner was one of this country€™s most popular writers during the 1920s and 1930s. He was also a chronic alcoholic who died prematurely at the age of forty-eight. The following table lists the life spans of some of Lardner€™s contemporaries (36). Those in the sample on the left were all problem drinkers; they died, on the average, at age sixty-five. The twelve (sober) writers on the right tended to live a full ten years longer. Can it be argued that an increase of that magnitude is statistically significant? Test an appropriate null hypothesis against a one-sided H1. Use the 0.05 level of significance. (The pooled sample standard deviation for these two samples is 13.9.)

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Authors Noted for Alchohol Abuse Authors Not Noted for Alchohol Abuse Age at Death Name Age at Death Name Ring Lardner Sinclair Lewis Raymond Chandler 7 Eugene O'Nl 65Van Wyck Brooks 77 Robert Benchley J.P. Marquand Dashiell e.e. cummings Edmund Wil 48 66 Carl Van Doren Ezra Pound 65 87 32 Randolph Bourne 56 67 John Crowe Ransom 86 Samuel Eliot Morrison 89 67T.S. Eliot Conrad Aiken 77en Ames Williams 64 70 84 Average: 65.2 Henry Miller Archibald MacLeish 90 James Thurber 67 75.5 Average: