An online news source reports that the proportion of smartphone owners who use a certain operating system is 0. 216. Two simulations will be conducted to create a sampling distribution of the sample proportion from a population with proportion 0. 216. Simulation a will consist of 1,000 trials with a sample size of 50. Simulation b will consist of 500 trials with a sample size of 100. Which of the following describes the centers and variabilities that should be apparent in the distributions generated by simulation a and simulation b?.