Compute the third quartile of the concentrations. Round your answer to three decimal places. mg/L
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- In a Ni-Cd battery, a fully charged cell is composed of nickelic hydroxide. Nickel is an element that has multiple oxidation states. Assume the following proportions of the states: Nickel Charge Proportions Found 0 0.17 +2 0.34 +3 0.33 +4 0.5-0.34 Determine the mean of the nickel charge. Please enter the answer to 2 decimal places.The following are the cystatin C levels (mg/L) for the patients described in Exercise 15 (A-17).Cystatin C is a cationic basic protein that was investigated for its relationship to GFR levels. In addition, creatinine levels are also given. (Note: Some subjects were measured more thanonce.) Cystatin C (mg/L) Creatinine (mmol/L) 1.78 4.69 0.35 0.14 2.16 3.78 0.30 0.11 1.82 2.24 0.20 0.09 1.86 4.93 0.17 0.12 1.75 2.71 0.15 0.07 1.83 1.76 0.13 0.12 2.49 2.62 0.14 0.11 1.69 2.61 0.12 0.07 1.85 3.65 0.24 0.10 1.76 2.36 0.16 0.13 1.25 3.25 0.17 0.09 1.50 2.01 0.11 0.12 2.06 2.51 0.12 0.06 2.34Source: D. M. Z. Krieser, M.D. Used with permission.(a) For each variable, compute the mean, median, variance, standard deviation, and coefficient ofvariation.(b) For each variable, construct a stem-and-leaf display and a box-and-whisker plot.(c) Which set of measurements is more variable, cystatin C or creatinine? On what do you baseyour answer? that question from…Suppose you have four classifications: freshmen (f), sophomore (so), junior (j), and senior (se). You construct a dummy variable, one for each classification that takes on the value of (1) should that classification be true for that observation and 0 otherwise. Further assume that you estimate the following model: E[GPA]= .5*ACT+.1*So+.2*J+.1*Se What is the omitted category? Enter 1 for Freshmen, 2 for Sophomores, 3 for Juniors, 4 for Seniors.
- 3. :-, Analysis of several plant-food preparations for potassium ion yielded the following data: Sample Percent K* 6.02, 6.04, 5.88, 6.06, 5.82 7.48, 7.47, 7.29 3.90, 3.96, 4.16, 3.96 1 2 3 4 4.48, 4.65, 4.68, 4.42 5.29, 5.13, 5.14, 5.28, 5.20 The preparations were randomly drawn from the same population. a. Find the mean and standard deviation s for each sample. b. Obtain the pooled value spooled- c. Why is spooled a better estimate of s than the standard deviation from any one sample?A sample of ore is found to be 0.0022% gold and 0.059% silver. What is the percentage of matter in the ore that is neither gold or silver?The following are the cystatin C levels (mg/L) for the patients described in Exercise 15 (A-17).Cystatin C is a cationic basic protein that was investigated for its relationship to GFR levels. Inaddition, creatinine levels are also given. (Note: Some subjects were measured more than once.)Cystatin C (mg/L) Creatinine (mmol/L)1.78 4.69 0.35 0.142.16 3.78 0.30 0.111.82 2.24 0.20 0.091.86 4.93 0.17 0.121.75 2.71 0.15 0.071.83 1.76 0.13 0.122.49 2.62 0.14 0.111.69 2.61 0.12 0.071.85 3.65 0.24 0.101.76 2.36 0.16 0.131.25 3.25 0.17 0.091.50 2.01 0.11 0.122.06 2.51 0.12 0.062.34Source: Data provided courtesy of D. M. Z. Krieser, M.D.(a) For each variable, compute the mean, median, variance, standard deviation, and coefficient ofvariation.(b) For each variable, construct a stem-and-leaf display and a box-and-whisker plot.(c) Which set of measurements is more variable, cystatin C or creatinine? On what do you base youranswer?
- 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 4.0) The following table shows 10 communities ranked by decayed, missing, or filled (DMF) teeth per 100 children and fluoride concentration in ppm in the public water supply: Rank by DMF Teeth FluorideCommunity per 100 children X Concentration Y 1 8 1 2 9 3 3 7 4 4 3 9 5 2 8 6 4 77 1…C-4) The concentration of active ingredient in a liquid laundry detergent is thought to be affected by the type of catalyst used in the process. Ten observations on concentration are taken with each catalyst, and the data follow: Catalyst 1: 57.9, 66.2. 65.4, 65.4, 65.2. 62.6, 67.6, 63.7, 67.2. 71.0 Catalyst 2: 66.4. 71.7. 70.3. 69.3, 64.8, 69.6, 68.6, 69.4, 65.3, 68.8. Find a 95% confidence interval on the ratio of active concentrations for the two catalysts, and explain it.
- Periodically, the county Water Department tests the drinking water of homeowners for contaminants such as lead and copper. The lead and copper levels in water specimens collected in 1998 for a sample of 10 residents of a subdevelopement of the county are shown below. lead (g/L) copper (mg/L) 2.9 0.2 5.1 4.2 5.5 1.2 0.3 1.3 4.9 1.7 0.133 0.774 0.214 0.671 0.444 0.234 0.357 0.761 0.176 0.888 (a) Construct a 99% confidence interval for the mean lead level in water specimans of the subdevelopment. OSASO (b) Construct a 99% confidence interval for the mean copper level in water specimans of the subdevelopment. ≤H≤The shelf life of a particular dairy product is normally distributed with a μ of 12 days and a σ of 3 days. What percent of the products last 15 or more days?In a study of processes used to remove impurities from cellulose goods, the following data resulted from a 24 experiment involving the desizing process. The four factors were enzyme concentration (A), PH (8), temperature (C), and time (0). Starch % by Weight Enzyme Temp. Time 1st Treatment (g/L) PH (1) 0.50 6.0 (°C) (hr) 60.0 2nd Repl. Repl. 6 9.72 13.50 а 0.75 6.0 60.0 6 9.80 14.04 b 0.50 7.0 60.0 6 10.13 11.27 ab 0.75 7.0 60.0 6 11.84 11.30 c 0.50 6.0 70.0 6 12.70 11.37 ac 0.75 6.0 70.0 6 11.96 12.05 bc 0.50 7.0 70.0 6 11.38 9.92 abc 0.75 7.0 70.0 6 11.80 11.14 d 0.50 6.0 60.0 8 13.15 13.00 ad 0.75 6.0 60.0 8 10.60 12.37 bd 0.50 7.0 60.0 8 10.37 12.00 abd 0.75 7.0 60.0 8 11.30 11.64 cd 0.50 6.0 70.0 8 13.05 14.55 acd 0.75 6.0 70.0 8 11.17 15.00 bcd 0.50 7.0 70.0 abcd 0.75 7.0 70.0 8 8 12.70 14.15 13.20 16.12 (a) Use Yates's algorithm to obtain sums of squares and the ANOVA table. (Round your answers to two decimal places.)