Fry Brothers Heating and Air Conditioning, Inc. employs Larry Clark and George Murnen to make service calls to repair furnaces and air conditioning units in homes. Tom Fry, the owner, would like to know whether there is a difference in the mean number of service calls they make per day. Assume the population standard deviation for Larry Clark is 1.05 calls per day, and 1.23 calls per day for George Murnen. A random sample of 40 days last year showed that Larry Clark made an average of 4.77 calls per day. For a sample of 50 days, George Murnen made an average of 5.02 calls per day.

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  1. Fry Brothers Heating and Air Conditioning, Inc. employs Larry Clark and George Murnen to make service calls to repair furnaces and air conditioning units in homes. Tom Fry, the owner, would like to know whether there is a difference in the mean number of service calls they make per day. Assume the population standard deviation for Larry Clark is 1.05 calls per day, and 1.23 calls per day for George Murnen. A random sample of 40 days last year showed that Larry Clark made an average of 4.77 calls per day. For a sample of 50 days, George Murnen made an average of 5.02 calls per day.

Hypothesis Test: Independent Groups (t test, pooled variance)

 

               

 

 

Larry

George

         

 

 

4.77

5.02

mean

       

 

 

1.05

1.23

std. dev.

       

 

 

40

50

n

       

 

               

 

   

88 

df

       

 

   

-0.25000

difference (Larry - George)

   

 

   

1.33102

pooled variance

     

 

   

1.15370

pooled std. dev.

     

 

   

0.24474

standard error of difference

   

 

   

0

hypothesized difference

   

 

               

 

   

-1.02

 t

       
   

.3098

 p-value (two-tailed)

     

 

               

 

   

-0.73636

confidence interval 95.% lower

   

 

   

0.23636

confidence interval 95.% upper

   

 

   

0.48636

margin of error

     

 

                       

 

At the .05 significance level, is there a difference in the mean number of calls per day between the two employees? What is the p-value?

**I just asked this question and they gave me just the answers. I do not want just the answers I want to know step by step ow to work the problem please

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