8 (1 point) An agricultural researcher plants 50 plots with a new variety of potatoes. A 90% confidence interval for the average yield for these plots is found to be 107.8 4.2 potatoes per acre. Which of the following would produce a confidence interval with a smaller margin of error than this one? Using 25 plots, rather than 50. Ob Using 100 plots, rather than 50. OI hope you don't select this answer Od I don't know