Question 1 (20 marks) Page 2 of 3 pages In Sweden, potato peel was found to contain concerming levels of Cd, forcing the National Food. Agency to recommend that people peel their potatoes prior to cooking. A study started to look at Canadian potatoes from different locations on one farm, looking at the flesh and the skin. (a) Is there evidence that Cd accumulates in the skin? Justify using the appropriate test. (b) Is 2.03 an outlier in the flesh colunan? Justify using the appropriate statistical test. (c) Assuming that the standard deviation for the skin samples set is similar to that of the population, what is the fraction of measurements that would yield a Cd concentration less than 2 ppb in the skin if over 20 mcasurements were made in total? Table 4-I Ordinate and area for the normal (Gaussian) error curve, y=21ez2/2 ar =[x+ BeMr b. The area refers to the areo befwed x=0 artd x= the vafue in the tuble. Thud the drea fromer =0 he x=1.4 is is (0,197+59,17793=0.3094. The codal area between z= and x=1 an is anify. Labled-1 Critical vulues of Student'et [ and F(=e122er2) at 9506 ronfirhono lassol: Question 1 (20 marks) Page 2 of 3 pages In Sweden, potato peel was found to contain concerming levels of Cd, forcing the National Food. Agency to recommend that people peel their potatoes prior to cooking. A study started to look at Canadian potatoes from different locations on one farm, looking at the flesh and the skin. (a) Is there evidence that Cd accumulates in the skin? Justify using the appropriate test. (b) Is 2.03 an outlier in the flesh colunan? Justify using the appropriate statistical test. (c) Assuming that the standard deviation for the skin samples set is similar to that of the population, what is the fraction of measurements that would yield a Cd concentration less than 2 ppb in the skin if over 20 mcasurements were made in total? Table 4-I Ordinate and area for the normal (Gaussian) error curve, y=21ez2/2 ar =[x+ BeMr b. The area refers to the areo befwed x=0 artd x= the vafue in the tuble. Thud the drea fromer =0 he x=1.4 is is (0,197+59,17793=0.3094. The codal area between z= and x=1 an is anify. Labled-1 Critical vulues of Student'et [ and F(=e122er2) at 9506 ronfirhono lassol