1. Ali required to use inductive coupled plasma mass spectroscopy (ICP-MS) to analyze amount of copper ion in wastewater samples. The following table shows the result of cop concentration from two different sample preparation methods. Concentration (mg/L) Sample Method A Method B Difference 1 0.39 0.36 0.04 2 1.35 0.84 0.51 2.56 1.76 0.8 4 3.92 3.35 0.57 5.35 4.69 0.66 9.33 7.7 1.63 7 10.70 10.52 0.18 8 10.92 10.81 0.11 a) What type of t test should be used to compare the two methods? Explain. b) Does the following result confirm a difference in the two methods at the 95% confiden level? Test the appropriate hypotheses. 3. 5,
1. Ali required to use inductive coupled plasma mass spectroscopy (ICP-MS) to analyze amount of copper ion in wastewater samples. The following table shows the result of cop concentration from two different sample preparation methods. Concentration (mg/L) Sample Method A Method B Difference 1 0.39 0.36 0.04 2 1.35 0.84 0.51 2.56 1.76 0.8 4 3.92 3.35 0.57 5.35 4.69 0.66 9.33 7.7 1.63 7 10.70 10.52 0.18 8 10.92 10.81 0.11 a) What type of t test should be used to compare the two methods? Explain. b) Does the following result confirm a difference in the two methods at the 95% confiden level? Test the appropriate hypotheses. 3. 5,
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Transcribed Image Text:1. Ali required to use inductive coupled plasma mass spectroscopy (1CP-MS) to analyze the
amount of copper ion in wastewater samples. The following table shows the result of copper
concentration from two different sample preparation methods.
Concentration (mg/L)
Sample
Method A
Method B
Difference
1
0.39
0.36
0.04
2
1.35
0.84
0.51
2.56
1.76
0.8
4
3.92
3.35
0.57
5
5.35
4.69
0.66
9.33
7.7
1.63
7
10.70
10.52
0.18
8
10.92
10.81
0.11
a) What type of t test should be used to compare the two methods? Explain.
b) Does the following result confirm a difference in the two methods at the 95% confidence
level? Test the appropriate hypotheses.
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