5.7.4. An estimator ◊ is said to be squared-error consis- tent for 0 if lim E[(ên – 0)²] = 0. n→∞ - (a) Show that any squared-error consistent ê, is asymp- totically unbiased (see Question 5.4.15). (b) Show that any squared-error consistent Ôn is consis- tent in the sense of Definition 5.7.1.