An experienced census official feels that she can accurately estimate the number of inhabitants of a city block by simply noting the size of the block and the types of buildings (single family homes, apartments, businesses, etc.) that are found on the block. This procedure, if accurate, would be much quicker and cheaper than visiting each residence and taking a survey of its inhabitants. The data below are estimates of block populations provided by the official for 10 blocks in a large city, and the actual numbers of inhabitants for the same 10 blocks. Inhabitants of City Blocks

Estimate 119 119 134 134 201 201 96 96 139 139 74
Actual 216 216 112 112 205 205 92 92 153 153 121

Required:
Find the value of the test statistic for testing whether there is a linear relationship between the actual number of inhabitants and the estimated number.