Do social recommendations increase ad effectiveness? A study of online video viewers compared viewers who arrived at an advertising video for a particular brand by following a social media recommendation link to viewers who arrived at the same video by web browsing. Data were collected on whether the viewer could correctly recall the brand being advertised after seeing the video. Complete parts (a) through (c) below. @ Click the icon to view the data on ad effectiveness and social media. a. Set up the null and alternative hypotheses to try to determine whether brand recall is higher following a social media recommendation than with only web browsing. Let population 1 correspond to video viewers with brand recall following a social media recommendation and population 2 correspond to video viewers with brand recall with only web browsing. H011 =1E2 H0: 1:1 #1:; H1:1L1#rc2 H1:rc1=1l2 V H0:1I:1Sr:2 H0::r:121t2 H111I1>I2 H1::t:1