> predict (mod, data. frame (headsize = 3650)) 1 1287 . 091 > predict (mod, data . frame (headsize = 3650), interval = "predictio h + conf . level = 95) fit 1wr upr 1 1287 . 091 1144.1 1430. 081 > predict (mod, data . frame (headsize = 3650), interval = "confidenc e + conf . level = 95) fit 1wr upr 1 1287 . 091 1277. 813 1296. 36812) For each of the following, report and interpret the appropriate 95% interval. a) (2 points) The researchers want to estimate the average brain weight for all adults who have a head size of 3650 cm3. b) (2 points) The researchers want to estimate the brain weight for an adult with a head size of 3650 cm3