The technology underlying hip replacements has changed asthese operations have become

Chapter 7, Problem 22

(choose chapter or problem)

The technology underlying hip replacements has changed asthese operations have become more popular (over 250,000in the United States in 2008). Starting in 2003, highlydurable ceramic hips were marketed. Unfortunately, for toomany patients the increased durability has been counterbalancedby an increased incidence of squeaking. The May 11,2008, issue of the New York Times reported that in one studyof 143 individuals who received ceramic hips between 2003and 2005, 10 of the hips developed squeaking.a. Calculate a lower confidence bound at the 95% confidencelevel for the true proportion of such hips thatdevelop squeaking.b. Interpret the 95% confidence level used in (a).