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4. Students measured the concentration of HCl in a solution by titrating with different indicators to...
Students measured the concentration of HCI in a solution by titrating with different indicators to find...
Students measured the concentration of HCI in a solution by titrating with different indicators to find the end point. (Use the table to find critical F values.) Mean HCl concentration (M) (t standard deviation) Indicator Number of measurements 1. Bromothymol blue 0.09565 0.00232 28 2. Methyl red 0.08688 t 0.00098 18 3. Bromocresol green 0.08641 t 0.001 15 29 Is the difference between indicators 1 and 2 significant at the 95% confidence level? Yes No Fcalculated degrees of freed om...
A 0.1 M HCl solution was standardized using the indicators Bromothymol Blue (BB), Methyl Red (MR),...
A 0.1 M HCl solution was standardized using the indicators Bromothymol Blue (BB), Methyl Red (MR), Bromocresol Green (BG), and Methyl Orange (MO). The results of the experiment are summarized below. Calculate the mean and standard deviation for each indicator. Based on this data, which indicator was best and why? (10 Points) Standardized Molarity Trial Group 1 Group 2 Group 3 Group 4 1 0.10942 0.1029 0.1293 0.09541 2 0.0954 0.0944 0.1287 0.09651 3 0.09817 0.1055 0.1222 0.09671 4 0.10143...
5. The active ingredient of a particular kind of drug tablet has traditionally been measured by...
5. The active ingredient of a particular kind of drug tablet has traditionally been measured by method A. A cheaper and quicker method B has been developed but its reliability has to be tested against method A. Each of 10 tablets is divided into two halves and the amount of active ingredient (in milligrams) is measured, one half-tablet by method A and the other by method B. The results are given below. Tablet Method A Method B Difference 97.2 97.2...
5. 130 pointsl The diameter of a ball bearing was measured by 12 inspectors each using two different kinds of calipers. The results are as follows: nspector 0.264 0.265 0.266 0.264 0.266 0.267 0.265...
5. 130 pointsl The diameter of a ball bearing was measured by 12 inspectors each using two different kinds of calipers. The results are as follows: nspector 0.264 0.265 0.266 0.264 0.266 0.267 0.265 0.267 0.2 0.265 0.265 10 0.269 69 Is there a significant difference between the means of the population of measurements from which the two samples were selected? Use α Find the p-value for the test in part (a) Construct a 95% confidence interval on the difference...
Suppose that students own an average of 4 pairs of jeans. 8 people from your class were surveyed to determine if the ave...
Suppose that students own an average of 4 pairs of jeans. 8 people from your class were surveyed to determine if the average for students in college is higher than 4. DATA TO USE: 3, 4, 4, 5, 5, 5, 7, 12 A) In words, CLEARLY state what your random variable X or P' represents. B) State the distribution to use for the test. If t, include the degrees of freedom. If normal, include the mean and standard deviation. C)...
"Glycemic index” is a measure of how quickly blood sugar level rises after eating a particular...
"Glycemic index” is a measure of how quickly blood sugar level rises after eating a particular food. (Glucose has a glycemic index of 100, while water has a glycemic index of 0.) A group of researchers wished to study glycemic index when dates and coffee were consumed together by individuals with type 2 diabetes. They performed a study on 10 subjects with diabetes. Firstly, they measured glycemic index for each patient after consuming dates without coffee. The mean was 53...
Many food products contain small quantities of substances that would give an undesireable taste o...
Many food products contain small quantities of substances that would give an undesireable taste or smell if they are present in large amounts. An example is the "off-odors" caused by sulfur compounds in wine. Oenologists (wine experts) have determined the odor threshold, the lowest concentration of a compound that the human nose can detect. For example, the odor threshold for dimethyl sulfide (DMS) is given in the oenology literature as 25 micrograms per liter of wine (µg/l). Untrained noses may...
My Ask You C-reactive protein (CRP) is a substance that can be measured in the blood. Values incr...
My Ask You C-reactive protein (CRP) is a substance that can be measured in the blood. Values increase substantially within & hours of an infection and reach a peak within 24 to 48 hours after. In adults, chronically high values have been linked to an increased risk of cardiovascular disease. In a study of apparently healthy children aged 6 to 60 months in Papua New Guinea, CRP was measured in 90 children. The units are milligrams per liter (mg/l). Here...
10:15 GX 1.51%. e s o s IL Multiple choice (60 p cholesben 1. The shape...
10:15 GX 1.51%. e s o s IL Multiple choice (60 p cholesben 1. The shape of the Men deviation 2. The standard Standard deviat i le devii d curve la tribal the value i n 15 3. Ir the were mad e is 2.5 or distribution is 45 and standard deviation of normal distributors is that the value of x for a distribution is 97.5 47.5 e 373 4 675 See other value. 4. Considering the normal distribution, pal...
Statistic questions
Short Answer 9. Suppose that you and a friend analyze the same sample data and conduct a test of significance about the same conjectured value, but you use a two-sided alternative and your friend uses a onesided alternative. a. Will you and your friend obtain different values of the test statistic? Explain briefly. b. Will you and your friend obtain different values of the p-value? Explain briefly. 10. The National Institutes of Health funded a study of a random sample of 856 people age...
Students measured the concentration of HCI in a solution by titrating with different indicators to find the end point. (Use the table to find critical F values.) Mean HCl concentration (M) (t standard deviation) Indicator Number of measurements 1. Bromothymol blue 0.09565 0.00232 28 2. Methyl red 0.08688 t 0.00098 18 3. Bromocresol green 0.08641 t 0.001 15 29 Is the difference between indicators 1 and 2 significant at the 95% confidence level? Yes No Fcalculated degrees of freed om...
5. The active ingredient of a particular kind of drug tablet has traditionally been measured by method A. A cheaper and quicker method B has been developed but its reliability has to be tested against method A. Each of 10 tablets is divided into two halves and the amount of active ingredient (in milligrams) is measured, one half-tablet by method A and the other by method B. The results are given below. Tablet Method A Method B Difference 97.2 97.2...
5. 130 pointsl The diameter of a ball bearing was measured by 12 inspectors each using two different kinds of calipers. The results are as follows: nspector 0.264 0.265 0.266 0.264 0.266 0.267 0.265 0.267 0.2 0.265 0.265 10 0.269 69 Is there a significant difference between the means of the population of measurements from which the two samples were selected? Use α Find the p-value for the test in part (a) Construct a 95% confidence interval on the difference...
My Ask You C-reactive protein (CRP) is a substance that can be measured in the blood. Values increase substantially within & hours of an infection and reach a peak within 24 to 48 hours after. In adults, chronically high values have been linked to an increased risk of cardiovascular disease. In a study of apparently healthy children aged 6 to 60 months in Papua New Guinea, CRP was measured in 90 children. The units are milligrams per liter (mg/l). Here...
10:15 GX 1.51%. e s o s IL Multiple choice (60 p cholesben 1. The shape of the Men deviation 2. The standard Standard deviat i le devii d curve la tribal the value i n 15 3. Ir the were mad e is 2.5 or distribution is 45 and standard deviation of normal distributors is that the value of x for a distribution is 97.5 47.5 e 373 4 675 See other value. 4. Considering the normal distribution, pal...
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