The technology underlying hip replacements has changed as these operations havebecome more popular (over 250,000 in the United States in 2008). Starting in 2003,highly durable ceramic hips were marketed. Unfortunately, for too many patients theincreased durability has been counterbalanced by an increased incidence ofsqueaking. The May 11, 2008, issue of the New York Times reported that in one studyof 143 individuals who received ceramic hips between 2003 and 2005, 10 of the hipsdeveloped squeaking.a. Calculate a lower confidence bound at the 95% confidence level for the trueproportion of such hips that develop squeaking.b. Interpret the 95% confidence level used in (a).
The technology underlying hip replacements has changed as these operations have
become more popular (over 250,000 in the United States in 2008). Starting in 2003,
highly durable ceramic hips were marketed. Unfortunately, for too many patients the
increased durability has been counterbalanced by an increased incidence of
squeaking. The May 11, 2008, issue of the New York Times reported that in one study
of 143 individuals who received ceramic hips between 2003 and 2005, 10 of the hips
developed squeaking.
a. Calculate a lower confidence bound at the 95% confidence level for the true
proportion of such hips that develop squeaking.
b. Interpret the 95% confidence level used in (a).
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