You hypothesize that younger adults are more stressed than all other age groups. You compare stress levels between three groups: Young adults, middle aged adults, and older adults. You collect data in 30 individuals and your data is as follows:    Young Adults Middle Aged Adults Older Adults 100 100 50 50 95 56 84 95 55 70 80 85 75 75 35 85 60 60 62 55 30 30 100 25 100 64 75 100 78 60     What is the critical value of f with α = .05?

Urban Travel Times Population of cities and driving times are related, as shown in the accompanying table, which shows the 1960 population N, in thousands, for several cities, together with the average time T, in minutes, sent by residents driving to work. City Population N Driving time T Los Angeles 6489 16.8 Pittsburgh 1804 12.6 Washington 1808 14.3 Hutchinson 38 6.1 Nashville 347 10.8 Tallahassee 48 7.3 An analysis of these data, along with data from 17 other cities in the United States and Canada, led to a power model of average driving time as a function of population. a Construct a power model of driving time in minutes as a function of population measured in thousands b Is average driving time in Pittsburgh more or less than would be expected from its population? c If you wish to move to a smaller city to reduce your average driving time to work by 25, how much smaller should the city be?