8. (12) An analyst measured the concentration of acid in a solution using two different indicators. His results were as follows: Mean [HCI] F stand. Dev. 0.02467 F 0.0045 0.02407 † 0.0032 #...

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Extracted text: 8. (12) An analyst measured the concentration of acid in a solution using two different indicators. His results were as follows: Mean [HCI] F stand. Dev. 0.02467 F 0.0045 0.02407 † 0.0032 # measurements Indicator A: 18 Indicator B: 12 Is the difference between the two indicators significant at the 95% confidence level? 15 etv MacBook Air 20 F3 DI DD F4 F5 F6 F7 F8 F9 F10 23 $ % & * 3 4 7 8 9 E Y G KI L


Extracted text: Degrees of freedom 50 90 95 98 99 99.5 99.9 1.000 0.816 0.765 6.314 12.706 31.821 2.920 2.353 63.656 127.321 636.578 9.925 1 4.303 6.965 14.089 31.598 3,182 2.776 2.571 12.924 4.541 3.747 3.365 3 5.841 7.453 2.132 2,015 1.943 1.895 1.860 5.598 4.604 4.032 8.610 6.869 4 0.741 0.727 0.718 4.773 6. 2.447 3.143 3.707 4.317 5.959 0.711 2.365 2.998 3.500 4.029 5.408 0.706 0.703 8 2.306 2.896 3.355 3.832 5.041 9 1.833 2.262 2.821 3.250 3.690 4.781 10 0.700 1.812 2.228 2.764 3.169 3.581 4.587 0.691 0.687 1.753 1.725 1.708 1.697 15 2.131 2.602 2.947 3.252 4.073 20 2.086 2.528 2.845 3.153 3.850 25 0.684 2.060 2.485 2.787 3.078 3.725 30 0.683 0.681 0.679 0.677 2.042 2.457 2.750 3.030 3.646 40 1.684 1.671 1.658 1.645 2.021 2.000 1.980 2.423 2.704 2.660 2.971 3.551 60 2,390 2.358 2.326 2.915 3.460 3.373 120 2.617 2.576 2.860 0.674. 1.960 2.807 3.291 NOTE: In calculating confidence intervals, a may be substituted for s in Equation 4-6 if you have a great deal of experience with a particular method and have therefore determined its "true" population standard deviation. If o is used instead ofs, the value of t to use in Equation 4-6 comes from the bottom row of Table 4-2. Next 5 étv MacBook Air F5 DI F6 F7 F8 F9 F10 F11 F12 & * 6. %3D Y { } J B N M + || * CO