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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
n1 = 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 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
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
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