A Civil Engineer Wants to Know If There Is a Relationship

Multiple Choice

A civil engineer wants to know if there is a relationship between the number of stoplights in a city and the number of wrecks during a six week period. He randomly samples 100 cities across the U.S. and gathers data on: 1) the number of stoplights in the city (ratio measurement scale) and 2) number of wrecks in that city during the past six weeks (ratio measurement scale) . Which statistical procedure is most appropriate to use to test the hypothesis?

A) Pearson correlation coefficient
B) Phi coefficient
C) Spearman or Kendall tau's correlation coefficient