Answers to the questions

1. If you follow the instruction well and your measurement is accurate, the graph should indicate satifactory agreement with Ohm's law.
2. Before I answer this question, I would like to review the equations for calculating the propagation of errors.
   Any physical quantity can be derived from one of the equations, or their combination, as follow:

   Z = ax + by +cz . . . (1)

   Z = ax^by^cz^d . . . (2)

   Z is a derived quantity, while x, y and z are primary quantitiies. For the primary quantities we can easily calculate their mean values and standard deviations. When we use either equation (1) or (2), or their combination, more errors will produce. How to evaluate the resultant errors? There are equations to calculate the propagated errors.

   For eq.(1): s_Z² =a² s_x² + b²s_y² + c²s_z²

   For R = R₁ + R₂, you can use this equation to evaluate the error of the resultant resistance of the combination of resistors connected in series.

   For Eq (2): s_Z²/Z_mean² =b² s_x²/x_mean² +c²s_y²/y_mean² + d²s_z²/z_mean²

   As for resistors connected in parallel, R = (R₁)(R₂)/(R₁ + R₂). . .(3), your can use Eq (1) and Eq(2), because you can modify Eq(3) into R = R₁R₂R_s^-1

   where R_s is the equivalent resistance of R₁ and R₂ connected in series, whose error can be evaluated by Eq (1).

   Without my explanation you should have understood to answer question 2 of the manual.

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