TABLE 13-3
the Director of Cooperative Education at a State

TABLE 13-3
The director of cooperative education at a state college wants to examine the effect of cooperative education job experience on marketability in the work place. She takes a random sample of 4 students. For these 4, she finds out how many times each had a cooperative education job and how many job offers they received upon graduation. These data are presented in the table below.
$$\begin{array}{l}\begin{array} { l l l } \hline \text { Student } & \text { CoopJobs } & \text { JobOffer } \\\hline 1 & 1 & 4 \\2 & 2 & 6 \\3 & 1 & 3\\4 & 0 & 1 \\\hline\end{array}\end{array}$$
-Referring to Table 13-3, the director of cooperative education wanted to test the hypothesis that the true slope was equal to 0. The denominator of the test statistic is Sb1. The value of Sb1 in this sample is _______.