Chapter 11, Problem 51CRE

Happiness and Age Consider the data from the happiness survey (see exercise 11.40). If you do a series of two-sample $t$ -tests comparing mean happiness of all pairs of the seven age groups, you will find that the p-value that compares happiness of those in their forties with those in their twenties, is 0.012. Would it be correct to say that the difference in mean happiness is statistically significant for those in their twenties and those in their for-ties? Explain.