The effect of sample size. An October 2007 Los Angeles Times Poll found that 52% of its sample preferred social spending to cutting taxes. Give a 95% confidence interval for the proportion of all adults who feel this way, assuming that the result ^p = 0.52 comes from a sample of size

(a) n = 750

(b) n = 1500

(c) n = 3000

(d) Explain briefly what your results show about the effect of increasing the size of a sample.