How Many Birds Do Domestic Cats Kill? "Domestic cats kill many more wild birds in the United States than scientists thought," states a recent article. Researchers used a sample of n = 140 households in the US with cats to estimate that 35% of household cats in the US hunt outdoors. A separate study used KittyCams to record all activity of n = 55 domestic cats that hunt outdoors. The video footage showed that the mean number of kills per week for these cats was 2.4 with a standard deviation of 1.51. Find a 90% confidence interval for the mean number of kills per week by US household cats that hunt outdoors. Round your answers to three decimal places. The 90 confidence interval is i !to Milius, S., "Cats kill more than one billion birds each year," Science News, 183(4),February 23, 2013, revised March 8, 2014. Data approximated from information give in the article. 2Loyd KAT, et al., "Quantifying free-roaming domestic cat predation using animal-borne video cameras," Biological Conservation, 160(2013), 183-189.