Homework Answers
Given data: 85.10, 84.62, 84.65, 84.70
Let us solve it for data point 85.10 because it seems to be little bit out of range
Step 1:
Arrange the data into increasing order (smallest to largest).
84.62, 84.65, 84.70, 85.10
Step 2
: Find the Q statistic using the following formula:
Where:· x2
suspected outlier, x1 next nearest data value, and
xn is the largest value.
Inserting the values
into the formula, we get:
Qexp = (85.10 – 84.70) / 85.10 – 84.62 = 0.4/0.48 =
0.833
Step 3: Find Q critical value for n = 4 for a confidence level 95% in the Q-table = 0.829
Step4: Compare the calculated to the tabulated critical Q-value
Q exp is greater than the Q critical (0.833 > 0.829)
Since Qexp > Qcrit, the point can be rejected at confidence level 95%
Add Answer to:
Replicate measurements of the sodium concentration (in ppm) yielded the following: 85.10, 84.62, 84.65, 84.70. Apply...
During a fluorescence measurement, 10 replicate measurements of the same calibration standard give the following values....
During a fluorescence measurement, 10 replicate measurements of the same calibration standard give the following values. Use the Q-test (95% confidence interval) to determine if any of the following measurements should be removed from the data set as an outlier Signal (counts/sec) 1044 1099 1104 1066 1024 1069 1033 1077 1200 1012
It is known from many careful measurements that the concentration of magnesium in a material is...
It is known from many careful measurements that the concentration of magnesium in a material is 0.135 wt %. Your new analytical procedure gives values of 0.129, 0.131, 0.136, 0.130, 0.128 and 0.127 wt %. Calculate the mean and standard deviation of the experimental data and determine whether a positive error is indicated at the 90% confidence level. Determine whether the value 0.136 should be rejected from the set of results. (t = 2.353 for three degrees of freedom and...
Six measurements were made of the magnesium ion concentration (in parts per million, or ppm) in...
Six measurements were made of the magnesium ion concentration (in parts per million, or ppm) in a city's municipal water supply, with the following results. It is reasonable to assume that the population is approximately normal. 188 135 160 173 183 168 Construct a 95% confidence interval for the mean magnesium ion concentration. A) 165.0 < µ < 170.7 B)164.7 < µ < 171.0 C)147.9 < µ < 187.8 D) 146.0 < µ < 189.7
Six measurements were made of the magnesium ion concentration (in parts per million, 21) or ppm)...
Six measurements were made of the magnesium ion concentration (in parts per million, 21) or ppm) in a city's municipal water supply, with the following results. It is reasonable to assume that the population is approximately normal. 188 135 160 173 183 168 Construct a 95% confidence interval for the mean magnesium ion concentration. A) 165.0 < μ < 170.7 B) 164.7 < μ < 171.0 C) 147.9 < μ < 187.8 D) 146.0 < μ < 189.7
The following replicate the molarities were obtained when standardizing a solution: 0.1067, 0.1071, 0.1066, and 0.1050....
The following replicate the molarities were obtained when standardizing a solution: 0.1067, 0.1071, 0.1066, and 0.1050. Can one of the results be discarded due to accidental error at the 95% confidence level? Why? Defend your answer using a Q test
1. Repeated analyses yielded the following set of results: 19.7, 19.0, 18.8, 19.1, 18.9, 18.7. Compute...
1. Repeated analyses yielded the following set of results: 19.7, 19.0, 18.8, 19.1, 18.9, 18.7. Compute the Grubbs statistic for these data with respect to the potential outlier, 19.7. Gcalculated = ____________ 2. Choose the statement which is a correct interpretation of the above result. a) 19.7 can be rejected with greater than 95% confidence. OR b) 19.7 has more than a 5% chance of being a member of the same population as the other measurements.
For the following replicate measurements, 2.4, 2.1, 2.1, 2.3, and 1.5, the mean is 2.08 and...
For the following replicate measurements, 2.4, 2.1, 2.1, 2.3, and 1.5, the mean is 2.08 and the standard deviation is 0.349. Develop a 90% confidence interval using the t-distribution to encase the true value. Compare this to a 90% confidence interval developed using a normal distribution. Values of t for Various Levels of Probability Degrees of Freedom 80% 90% 99% 99.9% 1 3.08 6.31 63.7 637 2 1.89 2.92 9.92 31.6 3 1.64 2.35 5.84 12.9 4 1.53 2.13 4.60...
SECTION B Answer ONE question from this section. 6. Answer ALL parts. A chemist used an...
SECTION B Answer ONE question from this section. 6. Answer ALL parts. A chemist used an analytical method to determine the amount of suspended solids in effluents from six different samples. Their data (in g) are presented in the following table: Mass/ 53.4 55.1 52.1 54.5 58.0 56.8 (a) Calculate the mean, mode and median for the mass measurements. (3 marks) (b) Calculate the standard deviation and relative standard deviation for this mass dataset. (6 marks) Calculate the minimum error...
Q test for outliers and calculation of mean for the Spectronic 20 data Table 1. %Transmittance...
Q test for outliers and calculation of mean for the Spectronic
20 data
Table 1. %Transmittance of Samples Using Different Sp ectrophotom Spectrophotometer Spectronic 20 Genesys 10UV %Transmittance Measurements 2 30.o 2s.9 *Mean, X 30 0 2 25.98 *Median *Do not include data that has been rejected by the Q-test. Q-test for outliers at the 95% confidence level. Show work for each data set in the space provided in the table below. If there are no questionable values, state that...
4 The homogeneity of the chloride level in a water sample from a lake was tested...
4 The homogeneity of the chloride level in a water sample from a lake was tested by analyzing portion drawn from the top and from near bottom of the lake, with the following results in ppm C: Top 26.30 26.43 26.28 26.19 26.49 Bottom 26.22 26.32 26.20 26.11 26.42 CHE2614/101/3/2019 a) Apply the t test at 95% confidence level to determine if the chloride level from the top of the lake is different from that at the bottom. b) Now...
It is known from many careful measurements that the concentration of magnesium in a material is 0.135 wt %. Your new analytical procedure gives values of 0.129, 0.131, 0.136, 0.130, 0.128 and 0.127 wt %. Calculate the mean and standard deviation of the experimental data and determine whether a positive error is indicated at the 90% confidence level. Determine whether the value 0.136 should be rejected from the set of results. (t = 2.353 for three degrees of freedom and...
SECTION B Answer ONE question from this section. 6. Answer ALL parts. A chemist used an analytical method to determine the amount of suspended solids in effluents from six different samples. Their data (in g) are presented in the following table: Mass/ 53.4 55.1 52.1 54.5 58.0 56.8 (a) Calculate the mean, mode and median for the mass measurements. (3 marks) (b) Calculate the standard deviation and relative standard deviation for this mass dataset. (6 marks) Calculate the minimum error...
Q test for outliers and calculation of mean for the Spectronic
20 data
Table 1. %Transmittance of Samples Using Different Sp ectrophotom Spectrophotometer Spectronic 20 Genesys 10UV %Transmittance Measurements 2 30.o 2s.9 *Mean, X 30 0 2 25.98 *Median *Do not include data that has been rejected by the Q-test. Q-test for outliers at the 95% confidence level. Show work for each data set in the space provided in the table below. If there are no questionable values, state that...
4 The homogeneity of the chloride level in a water sample from a lake was tested by analyzing portion drawn from the top and from near bottom of the lake, with the following results in ppm C: Top 26.30 26.43 26.28 26.19 26.49 Bottom 26.22 26.32 26.20 26.11 26.42 CHE2614/101/3/2019 a) Apply the t test at 95% confidence level to determine if the chloride level from the top of the lake is different from that at the bottom. b) Now...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago