Business Information Syestems&Data Analysis

Descriptive Statistics of Data

The above table shows that the mean of reliability in 2007 (3 .71 ) is higher than the mean of reliability of 2005 (3 .44 , the mean of support in 2007 (4 .13 ) is higher than the mean of support of 2005 (3 .37 ) and the mean of service in 2007 (3 .32 ) is higher than the mean of service of 2005 (3 .25 . Statistical analysis is still required to confirm the difference between the means of the mentioned variables 2 . Differences in ratings between 2005 and 2007

A

paired-sample T-test is conducted on the variables of 2005 and 2007 to statistically compare between the means of the variables reliability support and service

The above table shows the following

Since significance .05 (first row , then reliability in 2007 was higher than reliability in 2005

Since significance .05 (second row , then support in 2007 was higher than support in 2005

Since significance .05 (third row , then service in 2007 was higher than service in 2005

3 . Association between contract value for 2008 with each of the 2007 ratings for reliability , support and customer service and the length of the customer relationship

The above table shows that the four variables used predict 26 .9 of the contract value for 2008

The above table shows that the length of customer relationship (years is not statistically significant in predicting values for contract for 2008 , since sig .05

Equation to predict contract value for 2008

35 .297 2 .379 reliability - 2 .843 support 3 .471 service - .316 years

The model is rerun after omitting the variable years to produce the following results

The above table shows that the three variables used predict 24 .7 of the contract value for 2008 with little lost due to the omission of the variable length

The above table shows that all variables chosen are statistically significant in predicting values for contract for 2008 , since sig .05 for all three variables

Equation to predict contract value for 2008

30 .155 2 .332 reliability - 2 .354 support 3 .370 service...