In a study of the effects at stress on oehavior in rats, 52 rats were ranamly assigned to either a stressful environment or a control (nonstresstun environment. Aer 21 days, the change in weight (in grams) was determined for each rat. The table oelow summarizes data on weight gain. (The study report gave the standard error nf the mean s/, abbreviated as sen, ratherthan the standard deviation 5.] Gmup n 5 SEM stress 16 25.65 3 No stress 46 29.68 2 what are the standard deviations (i0.001) for the two groups't'? For "stress" group 5, : E For "ND stress" group 32 = Q what degrees cffreeam does the conservative Option 2 use for twarsample r prdcedures (07 these samples? E Test the null hypothesis of no difference between the [we group means against the twarsided alternative far or : 10%. The null hypothesis is 0 not rejected 0 rejected