People who oppose sex education in the schools often argue against it on the grounds that exposing ...

     People who   oppose sex education in the schools often argue against it on the grounds   that exposing teenagers to such information will make them more likely to   become sexually active at an early age. Those who support sex education in   the schools have argued that it actually makes teens less likely to become   sexually active. In an effort to find out whether sex education does have an   effect on sexual activity, the renowned sex researcher Alberta Kinsey decides   to perform an experiment. She takes a random sample of 8 students and gives   them a course in sex education. Years later, she conducts confidential   interviews to determine the age at which members of the sample became   sexually active. The results are as follows:      19 15 23 20 19 17 18 17      Previous research on students   who receive no sex education has shown that the age at which they become   sexually active is normally distributed with a mean of 16.2 years; the   standard deviation of the distribution is unknown, however. In order to   determine whether sex education has an effect on the age at which students   become sexually active, perform a two-tailed t test with an alpha level of   .05, following the steps below.