The scatter plot below shows the average traffic volume and average vehicle speed on a certain freeway for 50 days in 1999. Which statement best describes the relationship between average traffic volume and average vehicle speed shown on the scatter plot?

As traffic volume increases, vehicle speed increases at first, then decreases.
As traffic volume increases, vehicle speed decreases at first, then increases.
As traffic volume increases, vehicle speed increases.
As traffic volume increases, vehicle speed decreases

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

In order to be invited to tutoring or extension activities a students performance 20 point higher or lower than average for the

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle