5-G. Control chart. When a firearm is discharged, smoke residue is deposited on the hands, arms, chest, and face of the person firing the gun. Traditional forensic analysis focused on inorganic gunshot residue. Ion mobility spectrometry detects organic residue. A quality control standard of 5.0 ng of 2,6-di-t-butylpyridine deposited on a swab and dried was analyzed 18 times to establish the mean and standard deviation of the method. Find the mean and standard deviation for the first 18 quality control standards, and prepare a control chart for the full 40 observations. State whether or not the observations (Obs.) meet each criterion for stability in a control chart. Day Day Day Day Obs. (mv) Day Obs. (ppb) Obs. (ppb) Obs. (ppb) Obs. (ppb) 1 960 9 993 17 1 204 25 1 237 33 943 2 800 10 1 237 18 1 155 26 1 252 34 1 187 3 970 1 265 19 1 043 27 1 347 35 1 242 11 12 4 1 307 1 330 20 812 28 1 110 36 1 166 5 1 325 13 1 336 21 684 29 1 115 37 1 330 6 1 252 14 933 22 501 30 1 336 38 1 176 7 1 230 15 1 185 23 1 127 31 802 39 1 310 8 751 16 1 215 24 1 232 32 915 40 1 280 5-G. Control chart. When a firearm is discharged, smoke residue is deposited on the hands, arms, chest, and face of the person firing the gun. Traditional forensic analysis focused on inorganic gunshot residue. Ion mobility spectrometry detects organic residue. A quality control standard of 5.0 ng of 2,6-di-t-butylpyridine deposited on a swab and dried was analyzed 18 times to establish the mean and standard deviation of the method. Find the mean and standard deviation for the first 18 quality control standards, and prepare a control chart for the full 40 observations. State whether or not the observations (Obs.) meet each criterion for stability in a control chart. Day Day Day Day Obs. (mv) Day Obs. (ppb) Obs. (ppb) Obs. (ppb) Obs. (ppb) 1 960 9 993 17 1 204 25 1 237 33 943 2 800 10 1 237 18 1 155 26 1 252 34 1 187 3 970 1 265 19 1 043 27 1 347 35 1 242 11 12 4 1 307 1 330 20 812 28 1 110 36 1 166 5 1 325 13 1 336 21 684 29 1 115 37 1 330 6 1 252 14 933 22 501 30 1 336 38 1 176 7 1 230 15 1 185 23 1 127 31 802 39 1 310 8 751 16 1 215 24 1 232 32 915 40 1 280