The city council of Pine Bluffs is considering increasing the number of police in an effort to reduce crime. Before making a final decision, the council asked the chief of police to survey other cities of similar size to determine the relationship between the number of police and the number of crimes reported. The chief gathered the following sample information.

City	Police				Number of Crimes				City				Police				Number of Crimes
Oxford		12				17				Holgate				15				6
Starksville		15				13				Carey				8				18
Danville		20				6				Whistler				6				21
Athens		22				7				Woodville				17				7

a. Determine the regression equation. (Negative amounts should be indicated by a minus sign. Round your answers to 4 decimal places.)

y=_______+________x



b. Estimate the number of crimes for a city with 21 police officers. (Round your answer to the nearest whole number.)

Number of crimes


c. Interpret the regression equation.

For each policeman added, the number of crimes goes_________by one