4G .. 10:-) ( Homework 1 1. Following is the measurement data of seven different pennies. Messes of Seven United Pennies in Circulation What is the mean for the data? What are the standard deviation, the relative standard deviation, and the percent relative standard deviation for the data? What is the range of the data? What is the variance for the data? If the true value for the mass of the penny is 3.100 grams, what is the absolute and the percent relative errors? 2. What is the 95% confidence interval for the amount of aspirin in a group of 4 different analgesic tablets drawn from a population where true value is 250 mg and standard deviation is 25? The mean amount of aspirin in these 4 tablets is 244 mg. 3. Before determining the amount of Na2CO3 in an unknown Sample, a student decides to check her procedure by analyzing a sample known to contain 98.76% ww Na2CO3. Five replicate determinations of the %w/w Na2CO3 in the standard were made with the following results 98.71% 98.59% 98.62% 98.44% 98.58% Is the mean for these five trials significantly different from the accepted value at the 95% confidence level? 4. Results for two separate experiments to determine the mass of a circulating U.S. penny for two sets of measurements of 7 data points and 5 data points give us means of 3.117 and 3.081 while the standard deviations were 0.00259 and 0.00138 respectively. Determine whether there is a difference in the means of these analyses at 95% confidence level? 5. The following masses, in grams, were recorded in an experiment to determine the average mass of a U.S. penny. 3.067 3.049 3.039 2.514 3.048 3.079 3.094 3.109 3.102 Determine if the value of 2.514 g is an outlier at 95% confidence level. What will be the true mean in this case (outlier is removed)? 6. What is the CCIRUUSIWECHSRd addition 6. What is the difference between the standard addition method and the internal standard calibration method? Describe clearly with the help of figures. 4G .. 10:-) ( Homework 1 1. Following is the measurement data of seven different pennies. Messes of Seven United Pennies in Circulation What is the mean for the data? What are the standard deviation, the relative standard deviation, and the percent relative standard deviation for the data? What is the range of the data? What is the variance for the data? If the true value for the mass of the penny is 3.100 grams, what is the absolute and the percent relative errors? 2. What is the 95% confidence interval for the amount of aspirin in a group of 4 different analgesic tablets drawn from a population where true value is 250 mg and standard deviation is 25? The mean amount of aspirin in these 4 tablets is 244 mg. 3. Before determining the amount of Na2CO3 in an unknown Sample, a student decides to check her procedure by analyzing a sample known to contain 98.76% ww Na2CO3. Five replicate determinations of the %w/w Na2CO3 in the standard were made with the following results 98.71% 98.59% 98.62% 98.44% 98.58% Is the mean for these five trials significantly different from the accepted value at the 95% confidence level? 4. Results for two separate experiments to determine the mass of a circulating U.S. penny for two sets of measurements of 7 data points and 5 data points give us means of 3.117 and 3.081 while the standard deviations were 0.00259 and 0.00138 respectively. Determine whether there is a difference in the means of these analyses at 95% confidence level? 5. The following masses, in grams, were recorded in an experiment to determine the average mass of a U.S. penny. 3.067 3.049 3.039 2.514 3.048 3.079 3.094 3.109 3.102 Determine if the value of 2.514 g is an outlier at 95% confidence level. What will be the true mean in this case (outlier is removed)? 6. What is the CCIRUUSIWECHSRd addition 6. What is the difference between the standard addition method and the internal standard calibration method? Describe clearly with the help of figures