Cincinnati Paint Company sells quality brands of paints through hardware stores throughout the United States. The company maintains a large sales force who call on existing customers and look for new business. The national sales manager is investigating the relationship between the number of sales calls made and the miles driven by the sales representative. Also, do the sales representatives who drive the most miles and make the most calls necessarily earn the most in sales commissions? To investigate, the vice president of sales selected a sample of 25 sales representatives and determined:   The amount earned in commissions last month (y) The number of miles driven last month (x1) The number of sales calls made last month (x2

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 10CYU
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Cincinnati Paint Company sells quality brands of paints through hardware stores throughout the United States. The company maintains a large sales force who call on existing customers and look for new business. The national sales manager is investigating the relationship between the number of sales calls made and the miles driven by the sales representative. Also, do the sales representatives who drive the most miles and make the most calls necessarily earn the most in sales commissions? To investigate, the vice president of sales selected a sample of 25 sales representatives and determined:
 

  • The amount earned in commissions last month (y)
  • The number of miles driven last month (x1)
  • The number of sales calls made last month (x2)

 
The information is reported below.
 

Commissions ($000) Calls Driven Commissions ($000) Calls Driven
23 68 2,372 39 188 3,291
14 30 2,229 44 218 3,103
34 136 2,733 29 105 2,123
39 180 3,353 38 162 2,794
24 77 2,291 37 154 3,209
47 186 3,451 15 25 2,289
30 103 3,117 34 132 2,850
39 143 3,343 26 94 2,692
42 200 2,843 28 96 2,934
32 156 2,626 25 81 2,673
21 50 2,122 44 205 2,988
13 46 2,222 35 155 2,830
47 225 3,466      
 

 


 
Develop a regression equation including an interaction term. (Negative amount should be indicated by a minus sign. Round your answers to 3 decimal places.)
 

Commissions=   +   Calls +   Miles+   x1x2


 
Complete the following table. (Negative amounts should be indicated by a minus sign. Round your answers to 3 decimal places.)
 

Predictor Coefficient SE Coefficient t p-value
Constant        
Calls        
Miles        
x1x2        


 
Compute the value of the test statistic corresponding to the interaction term. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
 

 



At the 0.05 significance level, is there a significant interaction between the number of sales calls and the miles driven?

 

 

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