Before th e recession, jo b -c re a tin g cities in th e S un belt, like Las Vegas, Phoenix, a n d O rla n d o saw th e ir po pulations, in co m e levels, and housing prices surge. Las Vegas, however, offered som eth ing th a t often elu d ed these o th er cities:

u p w a rd m o b ility fo r th e w o rk in g class. For e xa m p le, h a rd ­

w o rkin g hotel m aids w ere able to prosper during th e boom tim es. According to th e Bureau o f Labor Statistics (BLS), th e average hourly rate for hotel m aids was $14.25 in Las Vegas, versus $9.25 in Phoenix and $8.84 in O rlando (The W a ll S treet Journal, July 2 0 , 2 0 0 9 ). S uppose th e fo llo w in g s u m m a ry statistics and ANOVA ta b le w ere produced for a = 0.05 from a s am p le o f h o u rly w a g e s o f 2 5 ho tel m aids in each city.

SUMMARY Groups Count Average Las Vegas 25 13.91 Phoenix 25 8.82 Orlando 25 8.83 ANOVA Source of Variation SS df MS F p-value F crit B etw een Groups 4 30 .8 7 2 2 15 .44 2 02 .90 2.58E -30 3 .124 W ith in G roups 76.44 72 1.06 Total 507.31 74

a. At th e 5% significance level, do m ean hourly rates for hotel maids differ b etw een th e th ree cities?

b. If differences exist, use Tukey's m e th o d to d e te rm in e w h ic h cities' m e a n ho u rly rates d iffer a t th e 5 %

significance level.