suppose that y1,y2,...,yn denote a random sample of sizenfrom a normal distribution with mean μand variance 1. consider the first observation as an estimator forμ.ashow thaty1is an unbiased estimator forμ.bfindp(|y1−μ|≤1).clook at the basic definition of consistency given in definition 9.2. based on the result ofpart (b), isy1aconsistentestimatorforμ?