R0 is a mathematical term that indicates how contagious a disease is by measuring how many
other cases, on average, arise from each infected case. For reference value, the seasonal flu has an
estimated median Ro of 1.28.
Early findings estimate that the Ro for COVID-19 has a 95% confidence interval of (1.4, 3.9). If
the same data used to construct this interval is used to construct a 90% confidence interval, which
of the following could be the 90% confidence interval?
(1.4, 3.9)
(1.9, 4.0)
(1.6, 3.7)
(1.2, 4.1)