The director of an alumni association wants to determine whether there is any type of relationship between the amount of an alumni's contribution (in dollars) and the number of years the alumnus has been out of school. Based on the data below, compute the value of the correlation coefficient between the number of years and the amount of the contribution. Years x 1 3 4 10 9 7 Contribution y 630 180 210 30 90 90

So then the correlation coefficient would be r =-0.8287  

Step-by-step explanation:

Information provided

Years x 1 3 4 10 9 7

Contribution y 630 180 210 30 90 90

And in order to calculate the correlation coefficient we can use this formula:  

For our case we have this:

n=6  

Replacing into the formula we got:

So then the correlation coefficient would be r =-0.8287  

no not all of them.

step-by-step explanation:

some of them have a square base.

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.