In order to evaluate a spectrophotometric method for the determination of titanium, the method was applied to alloy samples containing different certified amounts of titanium. The results (%Ti) are shown below.
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- in uncam dIfferent from the mean amount of airborne bacteria in uncarpeted rooms. To test this, carpeted and ount of bacteria on the dish was recorded The results are presented in the following table: Uncarpeted rooms Carpeted rooms 12.1 9.8 Sample mean of bacteria per ft' Sample std. dev. of bacteria per ft Number of rooms tested 3.2 2.7 23 %3D U.05 to see test if the amount off airborne bacteria is different in carpeted rooms than in uncarpeted rooms. I. State your hypotheses II. State the allowable type I error rate (a.) III. Calculate your test statistic, the p-value and draw the physical representation of the p-value IV. Make your decision to either reject the null or fail to reject the null. V. Make a concluding statement. b.) Run a 95% confidence interval for the hypothesis test above. Don't forget to make a proper conclusion.4. The following calibration data were obtained by an instrumental method for the determination of the species X in aqueous solution. Mean Analytical Signal, S Concentration X, Cx No. Replications, Standard Deviation, ppm 0.00 ppm 0.0079 25 0.031 2.00 5 0.173 0.0094 6.00 5 0.422 0.0084 10.00 5 0.702 0.0084 14.00 5 0.956 0.0085 18.00 1.248 0.0110 a. Calculate the calibration sensitivity. b. Calculate the analytical sensitivity at each concentration. c. Calculate the coefficient of variation for the mean for each of the replicate. d. What is the detection limit for the method?21 smooth/yellow 42 smooth/light-yellow 19 smooth/white 22 wrinkled/yellow 39 wrinkled/light-yellow 20 wrinkled/white Calculate the Chi Sqaure statistic of the data shown above:
- lustration 19.33. An examination was given to 50 students at College A and to 60 students at Collage B. At A, the mean grade was 75 with S.D.=9. At B, the mean was 79 with SD=7. Is there a significant difference in the performance at the two Colleges at 5% level of significance?The result below gives the amount (mg/mL) of ephedrine hydrochloride found in pharmaceutical preparations of Ephedrine Elixir B.P. by two different methods: derivative ultraviolet spectroscopy and an official assay method (the nominal amount in each sample was 3 mg/mL). Test whether the results obtained by the two methods differ significantly. Give answer of the output by using Excel . Sample Derivative Official 1 2.964 2.913 2 3.030 3.000 3 2.994 3.024The following calibration data were obtained by an atomic absorption spectrophotometric (AAS) method for the determination of mercury in an herbal product. 1. Calculate the calibration sensitivity.2. Calculate the coefficient of variation for the mean at 6.00 ppm
- A CEM 262 student determined the concentration of calcium in a solution using gravimetric analysis. The following concentrations were determined in the five trials: 6.004 g/L, 6.085 g/L, 6.029 g/L, 6.036 g/L, and 6.015 g/L. Use these values to answer the next six questions. Except where noted, report values with units. What is the mean value for this data set? Submit Answer Tries 0/99 What is the standard deviation of this data? Submit Answer Tries 0/99 What is the variance of this data? Submit Answer Tries 0/99 What is the RSD for this data? Please enter the numerical value for RSD without units. (The correct unit for RSD is ppt (parts per thousand), however currently CAPA is not recognizing ppt as a unit.) Submit Answer Tries 0/99 Based upon this data, at the 95% confidence level the true concentration (population mean) is expected to be between what two values? Maximum concentration? Submit Answer Tries 0/99 Minimum concentration? Submit Answer Tries 0/99Complete the table and answer the questions: Expected Expected (0- E)2 / E Phenotype Observed Observed Number Ratio Ratio Number Purple & smooth 9/16 9/16 95.25 153.1 216 Purple & 79 3/16 3/16 95.25 2.77 weinkled Yellow & 3/16 3/16 95.25 9.61 65 smooth Yellow & 21 1/16 1/16 95.25 57.88 wrinkled 381 E = x2 = 223 Total 381 What in your null hypothesis? What is the degrees of freedom? 3 According to Table 16.6, what is your critical value? 7.82 Do you accept your nall hypothesis? Why or why not?The result below gives the amount (mg/mL) of ephedrine hydrochloride found in pharmaceutical preparations of Ephedrine Elixir B.P. by two different methods: derivative ultraviolet spectroscopy and an official assay method (the nominal amount in each sample was 3 mg/mL). Test whether the results obtained by the two methods differ significantly. Calculate manually. Do not use excel . Sample Derivative Official 1 2.964 2.913 2 3.030 3.000 3 2.994 3.024
- fluorescence intensity(형광세기) in 5% acetic acid solution. A calibration curve was prepared by measuring the fluorescence intensities of a series of standards of increasing concentrations. The following data were obtained. Riboflavin (μg/mL) 0.000 0.100 0.200 0.400 0.800 Unknown sample Fluorescence intensity 0.0 5.8 12.2 22.3 43.3 15.4 (a) Use the method of least squares to obtain the best straight line through these five points (n=5). (b) Make a graph showing the experimental data aRiboflavin (Vitamin B2) is determined in a cereal sample by measuring its fluorescence intensity(형광세기) in 5% acetic acid solution. A calibration curve was prepared by measuring the fluorescence intensities of a series of standards of increasing concentrations. The following data were obtained. Riboflavin (μg/mL) 0.000 0.100 0.200 0.400 0.800 Unknown sample Fluorescence intensity 0.0 5.8 12.2 22.3 43.3 15.4 (a) Use the method of least squares to obtain the best straight line through these five points (n=5).…Random samples of two species of iris gave the following petal lengths (in cm). x1, Iris virginica 5.2 5.9 4.5 4.9 5.7 4.8 5.8 6.4 5.7 5.9 x2, Iris versicolor 4.5 4.9 4.7 5.0 3.8 5.1 4.4 4.2 Find the value of the chi-square statistic for the sample. (Round your answer to two decimal places.) What are the degrees of freedom? (b) Find a 90% confidence interval for the population standard deviation of x1. (Round your answers to two decimal places.) lower limit upper limit Find the value of the sample F statistic. (Round your answer to two decimal places.)The Figure below shows the calibration curve for the determination of an analyte. Knowing that the replicas of a sample showed the following signs: 0.114; 0.117 and 0.115, answer: Which option below shows the mean concentration (mg/L), standard deviation (mg/L) and relative standard deviation (%), respectively? a) 144.5 mg/L; 6.7 mg/L and 1%b) 244.5 mg/L; 3.3 mg/Le 10%c) 227.9 mg/L; 3.1 mg/l and 1% In the graph, the y axis represents the signal and the x axis the concentration mg/L