The average life expectancy in a certain country is 70.2 years. Estimate the country’s life expectancy in hours. Then use a calc
1 answer:
You might be interested in
Answer:
(513.14, 860.36) is a 98% confidence interval for the true mean
Step-by-step explanation:
We have a small sample size of n = 15, the mean balance was with a standard deviation of s = 256.20. The confidence interval is given by
where
is the 100
th quantile of the t distribution with n-1=15-1=14 degrees of freedom. As we want a
% = 98% confidence interval, we have that
and the confidence interval is
where
is the 1st quantile of the t distribution with 14 df, i.e.,
. Then, we have
and the 98% confidence interval is given by (513.1379, 860.3621)