One factor in the development of tennis elbow, a maladythat strikes fear in the hearts of all serious tennis players,is the impact-induced vibration of the racket-and-armsystem at ball contact. It is well known that the likelihoodof getting tennis elbow depends on various propertiesof the racket used. Consider the scatterplot of x 5racket resonance frequency (Hz) and y 5 sum of peakto-peakacceleration (a characteristic of arm vibration,in m/sec/sec) for n 5 23 different rackets (Transfer ofTennis Racket Vibrations into the Human Forearm,Medicine and Science in Sports and Exercise, 1992:11341140). Discuss interesting features of the data andscatterplot.

ST 512: Week One Notes MaLyn Lawhorn August 16, 2017 Estimates and Estimators ▯ Estimating occurs when we need to approximate an unknown parameter ▯ ▯ to estimate, we use data that comes in the form of random variable Y , Y , Y , ▯▯▯, Y . 1 2 3 N ▯ An estimator is the algorithm, function, or equation used to approximate ▯. ▯ An estimate is the numerical output of the estimator. Example 1 Consider the following data set of the ages that a group of individuals got married: 23, 27, 29, 26, 31, 23, 24, 24, 29, 23, 27, 30, 30, 29, 25 Suppose we wanted to ﬁnd the true mean ▯ of when an individual gets marri