those questions are for QUANTITATIVE BIOLOGY please make sure that the answers are correct I will rate :)

Question 4 1.5 pts Researchers studying the number of electric fish species living in various parts of the Amazon basin were interested in whether the presence of tributaries affected the local number of electric fish species in the main rivers (Fernandes et al. 2004) They counted the number of electric fish species above and below the entrance point of a major tributary at 12 different river locations. Here is what they found: Upstream Downstream number of number of Tributary species species Ica 14 19 Jutai 11 8T Japura 8 8 Coari 5 7 Purus 10 16 Manacapuru 5 6 Negro 23 24 Madeira 29 30 Trombetas 19 16 Tapajos 16 20 Xingu 25 21 Tocantins 10 12 What is the mean difference in the number of species between areas upstream and downstream of the tributary? Round your answer to two decimal places. (answer should be positive)Question 7 1.5 pts The summary stats for Acorn Data from 1995 is as follows: Riverside: . Mean = 5.525 . Stdev = 0.266 . Var = 0.061 . N = 20 Ridgeline . Mean = 4.456 . Stdev = 0.799 . Var = 0.413 . N = 20 Using GraphPad QuickCals Ex, determine what would happen to the t-value if the Riverside mean decreased to 4.215? [ Select ]