Please help me with these questions

1) Come up with a 2 x 2 contingency table for which 131 =152 , and for which the row and column totals are not the same. Now calculate x\". Are you surprised? Why or why not? 2) You want to examine competition in barnacles. You examine two species and count the number of each species at the low and high water marks (many bamacles live in tidal areas). You get the following results: Low water High water Species A 63 13 Species B 21 54 (a) Are the two species of barnacle independent of water level? (b) Which species prefers low water? Which prefers high water? (You need to calculate some proportions to answer this question). 3) You want to nd out if there is a food preference in between two species of bats. You collect the following data: Moths Beetles Bat species A 13 13 Bat species B 7 49 Do both species of bat have the same food preferences