The value of the correlation coefficient can also be found by using the formula r = bsx / sy
Where sx is the standard deviation of the x values and sy is the standard deviation of the y values. Verify this result for Exercises 18 and 20 of Section 10€“1.
Exercise 18:
The data below show the number of three-base hits (triples) and the number of home runs hit during the season by a random sample of MLB teams. Is there a significant relationship between the data?

Exercise 20:
An emergency service wishes to see whether a relationship exists between the outside temperature and the number of emergency calls it receives for a 7-hour period. The data are shown.

Triples Homeruns 212 199 144 160 149 122 25 23 5 1920 43 Temperature68 74 82 88 93 99 101 No. of calls y 7 4 8 10 11 9 13