Use the Data Given Below to Answer the Following Question(s)

Essay

Use the data given below to answer the following question(s).
The following extract from a manufacturer's database shows a sample of 10 suppliers, their transportation charges, and the estimated and actual total costs of supplying materials.(Note: Assume a significance level of 0.05 wherever necessary.)
$$\begin{array} { | c | c | c | c | } \hline \text { Supplier } & \begin{array} { c } \text { Transportation } \\\text { Charges }\end{array} & \begin{array} { c } \text { Estimated Total } \\\text { Cost }\end{array} & \text { Actual Total Cost } \\\hline \text { Peter } & 340 & 4,500 & 4,680 \\\hline \text { John } & 560 & 4,500 & 4,790 \\\hline \text { Martin } & 480 & 4,500 & 5,110 \\\hline \text { Philip } & 290 & 4,500 & 4,780 \\\hline \text { Mark } & 370 & 4,500 & 4,810 \\\hline \text { Thomas } & 520 & 4,500 & 4,770 \\\hline \text { Taison } & 350 & 4,500 & 5,250 \\\hline \text { David } & 430 & 4,500 & 4,930 \\\hline \text { Carter } & 510 & 4,500 & 5,010 \\\hline \text { Leonard } & 270 & 4,500 & 4,810 \\\hline\end{array}$$
-On studying the database, the manufacturer found out that the average difference between the estimated and actual total costs was $426.Based on the sample data, can the manufacturer conclude that the average difference between the estimated and actual total costs is different from zero?