Lead Measurement. Laboratories A and B made multiple measurements on prepared wastewater effluent specimens to which lead (Pb) had been added in the amount of 1.25 µg/L or 2.5 µg/L. The background lead concentration was low, but not zero. Compare the bias and precision of the two laboratories. Laboratory A Spike = 1.25 1.1 Spike = 2.5 2.8 Laboratory B Spike = 1.25 2.35 Spike = 2.5 5.30
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Two laboratories A and B collected data related to wastewater in which lead was added in two quantities - 1.25 and 2.5 respectively.
The observations were recorded in a table.
There was also a low background concentration of lead in the wastewater, but due to the uniform nature of its distribution, it will not effect the measure of bias in the data.
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- For each of the questions 1-4, answer the following (a-h are steps in a Hypothesis Test, see page 376 of your ebook). For steps f and g do both the p-value method and the critical value method: a) Claim in English: b) Claim in Symbolic Form: c) Null and Alternate Hypothesis: d) Significance Level: e) Test Statistic: f) Find Values: g) Make a Decision: h) Restate the Decision in Nontechnical Terms: i) If this is a statistically significant result, is it also a practically significant result?Samples are collected from the River X and pH values are observed. 9 different pH values are listed in table 3. Table 3 Concentrations 4.2 Draw box plot and find a. Bowley's coefficient of skewness b. Karl Pearson's coefficient of skewness c. Third moment 3.8 6.0 3.5 8.1 4.9 4.1 3.2 4.0n. ln. N Ciectical Cnyineers GToup as Cv = 40.32 % The following data represent the results obtained from the specific gravity (S.G.) test performed ina soil laboratory including * ?for sand samples. Find the mode Number of Specific Gravity 2.30-2.39 Samples 2.40-2.49 2.50-2.59 4 6. 2.60-2.69 12 2.70-2.79 14 2.80-2.89 2 3.35-3.40 2.10-2.15 2.20-2.25 2.70-2.75 2.80-2.85 2.30-2.35 2,60-2.65 2.40-2,45 2.50-2.55 2.90-2.95 ارفع اجابتك بشكل ملف wdf او صورة 1O 0O 10 O O O O O
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