A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 3 percentage points with 95% confidence if (a) he uses a previous estimate of 32%?

(b) he does not use any prior estimates?

a)  

And rounded up we have that n=929

b)  

And rounded up we have that n=1068

Step-by-step explanation:

Part a

The margin of error for the proportion interval is given by this formula:  

   (a)  

And on this case we have that and we are interested in order to find the value of n, if we solve n from equation (a) we got:  

  (b)  

For a confidence of 95% we have that the significance is and the critical value would be:

And replacing into equation (b) the values from part a we got:

And rounded up we have that n=929

Part b

For this case since we don't have prior info we can use as estimator for the true proportion the value and replacing we got:

And rounded up we have that n=1068

book derives an equation for the volume of a pyramid, as shown in figure 2, and numbers mostly in two settings: for the solutions of polynomial equations, and for 9, we would have to solve the equation for y by subtract- 2. the point (1,. 2) is the center of the circle whose equation is x2 y2. 2x. 4y p.w.c. davies.

step-by-step explanation: