An experimental design for a paired t test has 18 pairs of identical twins. How many degrees of freedom are there in this t test? . . . There are degrees of freedom. (Simplify your answer.)A survey of 700 adults from a certain region asked, "What do you buy from your mobile device?" The results indicated that 48% of the females and 41% of the males answered clothes. The sample sizes of males and females were not provided. Suppose that of 300 females, 144 reported they buy clothing from their mobile device, while of 400 males, 164 reported they buv clothino from their mobile device. Complete Darts (a) throuoh ldl below. <:> a. Is there evidence of a difference between males and females in the proportion who said they buy clothing from their mobile device at the 0.01 level of signicance? State the null and alternative hypotheses, where n1 is the population proportion of females who said they buy clothing from their mobile device and 1:2 is the population proportion of males who said they buy clothing from their mobile device. 0 A. HO: 31:1 =Tl:2 O B. HO: 31:1 =TE2 H1::t1at2 H1::t1>at2 O O. H0: 3131 #7122 O D. H0: 3131 #7152 H123t1=3122 H123t13122 H123t11l2 H1:7r.1>at2 O C. HO:E1=TI:2 O D. HO:I1 =1t2 H1:at1:r:2 H1:arr.1 a. At the 0.05 level of signicance, is there evidence of a difference between B2B marketers and B20 marketers in the proportion that commonly use the business social media tool? Let population 1 correspond to BZB marketers and population 2 correspond to 320 marketers. Choose the correct null and alternative hypotheses below. 0 A. H0:7c1#:rtz O B. Hoit1=2 H1:7r.1=7t2 H1zat11t2 O C. H0:1r.1 21:2 0 D. H0:at151t2 H1:I1<2 h1:tc1>