QuestionHow Many Birds Do Domestic Cats Kill? "Domestic cats kill many more wild birds in the United States than scientists thought," states a recent article. ${ }^{1}$ 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 ${ }^{2}$ 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 $99 \%$ 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 99 confidence interval is i $\square$ to i $\square$ ${ }^{1}$ 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. ${ }^{2}$ Loyd KAT, et al., "Quantifying free-roaming domestic cat predation using animal-borne video cameras," Biological Conservation, 160(2013), 183-189.