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...

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		15				17				Holgate				17				7
Starksville		17				13				Carey				12				21
Danville		25				5				Whistler				11				19
Athens		27				7				Woodville				22				6

Click here for the Excel Data File

1. 
   

   Which variable is the dependent variable and which is the independent variable? Hint: Which of the following makes sense: Cities with more police have fewer crimes, or cities with fewer crimes have less police?

   
   

1. 
   

   Choose the scatter diagram that best fits the data.

   
   

Scatter diagram 1	Scatter diagram 2	Scatter diagram 3

multiple choice

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  Scatter diagram 1

  
  

  
  
  
  


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  Scatter diagram 2

  
  

  
  
  
  


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  Scatter diagram 3

  
  

  
  
  
  

1. 
   

   
   c&d. Fill in the blanks below.(Negative values should be indicated by a minus sign. Round your answers to 3 decimal places.)
   

   
   

x⎯⎯x¯
y⎯⎯y¯
Sx
Sy
Coefficient of correlation
Coefficient of determination