Question

27. (11 pts) A student measured the Ca$^{2+}$ content in two water samples: bottle drinking water and tap water. The results of this experiment were: Bottle water: 68.74 ± 0.92 ppm (n = 5) Tap water: 65.10 ± 0.63 ppm (n = 5) a. How many total degrees of freedom are there in the analysis? b. Do the water samples contain statistically different amounts of Ca$^{2+}$ at the 95% confidence level? (Note: no significant difference between the two standard deviations.) You must show the calculation to get the credit. Confidence Level (%) Degrees of Freedom 50 90 95 98 1 1.000 6.314 12.706 31.821 2 0.816 2.920 4.303 6.965 3 0.765 2.353 3.182 4.541 4 0.741 2.132 2.776 3.747 5 0.727 2.015 2.571 3.365 6 0.718 1.943 2.447 3.143 7 0.711 1.895 2.365 2.998 8 0.706 1.860 2.306 2.896 9 0.703 1.833 2.262 2.821 10 0.700 1.812 2.228 2.764

Name: 27 11 pts a student measured the ca2 content in two water samples bottle drinking water and tap water the results of this experiment were bottle water 6874 092 ppm n 5 tap water 6510 063 ppm 38343
Uploaded: 2022-01-24T04:59:04-08:00
Duration: 3 min 5 s
Channel: Dominador Tan
Description: 27 11 pts a student measured the ca2 content in two water samples bottle drinking water and tap water the results of this experiment were bottle water 6874 092 ppm n 5 tap water 6510 063 ppm 38343

          27. (11 pts)
A student measured the Ca$^{2+}$ content in two water samples: bottle drinking water and tap water. The results of this experiment were:
Bottle water: 68.74 ± 0.92 ppm (n = 5)
Tap water: 65.10 ± 0.63 ppm (n = 5)
a. How many total degrees of freedom are there in the analysis?
b. Do the water samples contain statistically different amounts of Ca$^{2+}$ at the 95% confidence level? (Note: no significant difference between the two standard deviations.)
You must show the calculation to get the credit.
Confidence Level (%)
Degrees of Freedom
50
90
95
98
1
1.000
6.314
12.706
31.821
2
0.816
2.920
4.303
6.965
3
0.765
2.353
3.182
4.541
4
0.741
2.132
2.776
3.747
5
0.727
2.015
2.571
3.365
6
0.718
1.943
2.447
3.143
7
0.711
1.895
2.365
2.998
8
0.706
1.860
2.306
2.896
9
0.703
1.833
2.262
2.821
10
0.700
1.812
2.228
2.764

27 11 pts a student measured the ca2 content in two water samples bottle drinking water and tap water the results of this experiment were bottle water 6874 092 ppm n 5 tap water 6510 063 ppm 38343

Added by Craig M.

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