Preventing drowning Drowning in bathtubs is a major cause of death in children less than 5 years old. A random sample of parents was asked many questions related to bathtub safety. Overall, $85\%$ of the sample said they used baby bathtubs for infants. Estimate the percent of all parents of young children who use baby bathtubs.

Except for birth abnormalities, drowning kills more infants between the ages of one and four.

Drowning occurs in a matter of seconds and is frequently silent.

Anyone can drown at any time when there is access to water.

One proportion: $z$test/interval with one sample

There are two proportions: $z$test/interval with two samples

Interval $t$test/one-sample $t$test/one-sample $t$test/one-sample $t$test/one-

Two methods are used: a two-sample $t$test and an interval test.

If you wish to check for a difference, equality, increase, or reduction, use a test. If you want to estimate an interval in which the true value lies, use an interval.

Because we wish to estimate the true value of one proportion, we utilize a one-sample $z$interval (percent).