According to a government​ agency, ​22.4% of the population of a certain country smoked in 2016. In 2018​, a random sample of 696 citizens of that country was​ selected, 114 of whom smoked. Construct a ​99% confidence interval to estimate the actual proportion of people who smoked in the country in 2018.
The confidence interval has a lower limit of
and an upper limit of
.

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.