1. a car dealership conducted a survey. it showed that a younger
customer tended to purchase a lower priced car. what is likely true?
there is no correlation between age and purchase price.
he
there is a correlation between age and purchase price. there may or may
not be
causation. further studies would have to be done to determine this.
there is a correlation between age and purchase price. there is probably
also
causation. this is because there is a decrease in the purchase price with a
decrease
in age.

There are two major tests of readiness for college: the act and the sat. act scores are reported on a scale from 1 to 36. the distribution of act scores in recent years has been roughly normal with mean µ = 20.9 and standard deviation s = 4.8. sat scores are reported on a scale from 400 to 1600. sat scores have been roughly normal with mean µ = 1026 and standard deviation s = 209. reports on a student's act or sat usually give the percentile as well as the actual score. the percentile is just the cumulative proportion stated as a percent: the percent of all scores that were lower than this one. tanya scores 1260 on the sat. what is her percentile (± 1)?