Gene mutations have been found in patients with muscular dystrophy. In one study, it was found that

Question:

Gene mutations have been found in patients with muscular dystrophy. In one study, it was found that there were defects in the gene coding of sarcoglycan proteins in 23 of 180 patients with limb-girdle muscular dystrophy.19
Use these data to construct a 99% confidence interval for the corresponding population proportion.