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What is the meaning of a confidence interval?
In chemistry there are many ways to check the deviation of experimental data from the accurate value. These different methods provide difference between accuracy and precisions of the experimental data which can be further used to calculate the error percentage in the experiment.
Confidence interval can be defined as the amount of uncertainty associated with the experimental set of data. For example; the accurate mass of the substance must be 30 g then the confidence interval that the answer probably lies between 20-40 g.
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- Other things being equal, the margin of error of a confidence interval increases as A the confidence level decreases. B the population standard deviation increases. The sample mean increases. D the sample size increases.Student Discipline Problems The data for a random sample of 32 months for the number of discipline problems that occurred each month at a large high school are shown. Find the 99% confidence interval for the mean when σ 3. Round your answers to one decimal place. = 13 19 10 11 14 25 16 27 22 29 23 29 28 17 17 22 28 26 29 20 22 18 14 215 16 27 17 14 17 110 11 20 19 22 Send data to Excel We are 99% confident that the mean is between 15.1 and 17.8 discipline problems per month.Calculate the mean and 90% confidence interval for the data set. Sample Value 1 8.0626 8.0650 3 8.0583 4 8.0564 8.0571 6. 8.0600 mean: étv A A hulu 2. 5.
- Systematic error causes the mean of a data set to differ from the accepted value. True False7. From the normal curve of error, find the probability that a result is outside the limits of ±2σ from the mean. What is the probability that a result has a more negative deviation from the mean than -2σ?Which of the following would be a correct interpretation of a 99% confidence interval such as 4.1Explain the difference between an average and a weighted averagePlease confirm if my answer is correct or not. Due to the need for this to be correct I would like you to provide me with a confidence score in you answer on a scale from 1 to 10 how confident are you in your answer. Please be sure to double check your answerThe concentrations of K* in water were measured with atomic absorption spectroscopy (AAS) and atomic emission spectroscopy (AES). Four water samples obtained at different cities were used, and each sample was measured one time. The measurements are shown in the table below: Tulare Clovis 8.9 ppm 6.7 ppm 7.0 ppm 5.0 ppm What is the calculated t-value (tcalculated) for the statistical comparison of these two methods? AAS AES 1.908 2.664 2.309 2.938 3.012 Fresno 5.5 ppm 5.4 ppm Selma 12.5 ppm 9.8 ppmWeight of coin 1 (g) 11.4286 Weight of coin 2 (g) 11.4633 Weight of coin 3 (g) 11.4632 Weight of coin 4 (g) 11.5468 Weight of coin 5 (g) 11.5691 Mean (g) 11.4942 SD 0.0604068290841 %RSD 0.53% Check for suspicious outliers by using the Grubb’s test.For the numbers 116.0, 97.9, 114.2, 106.8 and 108.3, find the range and 90% confidence interval for the mean.Chemistry In an analysis of the content of carbohydrate present in a glycoprotein, the following results were found: 12.6, 11.9, 13.0, 12.7 and 12.5 g of carbohydrate per 100 g of protein. Taking into account that σ is unknown, the confidence interval for the average value at a 90% confidence level of the carbohydrate content is: Select one:to. 12.5 ± 0.4b. 12.5 ± 0.2c. 12.5 ± 0.5d. 12.5 ± 0.3SEE MORE QUESTIONS