# HMWK 3 - C211 Homework 3 FA 2015 Name 10 points Due Monday...

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C211 Homework 3 FA 2015 Name _____________________ 10 points. Due Monday Sept 21 by 5 pm. Show all work. No late papers accepted. 1. A clinic performed 4 analyses of lead in the blood of an infant, and got the following readings: 63 g/dL 64 g/dL 67 g/dL 86 g/dL It is urgent to begin treatment of lead poisoning in infants for levels of 70 g/dL or higher, however the treatment itself is risky and poses dangerous side effects. It is not recommended unless it is clear the child has lead poisoning. (a) (0.3 pt) Show by Q-test if there is an outlier at the 95% confidence level. (b) (0.4 pt) Calculate the average value of Pb in the infant’s blood, with and without the outlier. (c) (0.3 pt) The medical/ethical problem (dilemma) is: (d) (0.2 pt) The physician should….? (Hint: If this were a child you cared about, what would you want the physician to do?)

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2. (0.8 pt) Use a Grubb’s Test to determine if this data set contains an outlier value, at 95% confidence level. 3.66 3.45 3.45 3.44 3.43 You may use statistics software to calculate the mean and std. deviation. The Grubb’s test and 95% confidence table are posted on BlackBoard. x = s = G calc = G crit = 3. A standard addition analysis was performed for strontium in tooth enamel from archeological human specimens. Each solution had total volume = 10.0 mL and contained 0.750 mg dissolved tooth enamel. Various concentrations of added Sr standard are shown in the data
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