3. Nutritional researchers are comparing sodium levels of two different brands of canned black beans. They randomly selected 5 cans from each of the two brands. The following are the observed sodium levels (in mg): Brand 1: 580, 592, 588, 589, 581 Brand 2: 579, 582, 577, 598, 583 Let M1, /2 be the true mean sodium level for cans of black beans made by Brand 1 and Brand 2 respectively. We can assumme normality (a) [1 mark] Using R, calculate and compare the standard deviations of the two sam- ples. Indicate whether you should use pooled procedures or unpooled procedures for these data. (b) [1 mark] Give the command and output to test the hypotheses Ho : /1 - /2 = 0, H1 : H1 - 12 # 0. (c) [1 mark] What is the p-value for the test? (d) [1 mark] What is the strength of evidence against Ho