Performance-based logistics. Refer to the Journal of Business Logistics (Vol. 36, 2015) study of the factors that lead to successful performance-based logistics projects, Exercise $8.15$ (p. 443). You used the data in the PBL file to test whether commercial suppliers have less experience, on average, than government employees. Due to small samples $\left(n_1=6\right.$ commercial suppliers and $n_2=11$ government employees), the test requires the variance of experience to be the same for the two populations. Locate the $p$-value of the test on the printout.

Performance-based logistics. Refer to the Journal of Business Logistics (Vol. 36, 2015) study of the factors that lead to successful performance-based logistics projects, Exercise $8.15$ (p. 443). You used the data in the PBL file to test whether commercial suppliers have less experience, on average, than government employees. Due to small samples $\left(n_1=6\right.$ commercial suppliers and $n_2=11$ government employees), the test requires the variance of experience to be the same for the two populations. Find the value of the test statistic on the accompanying XLSTAT printout.

Performance-based logistics. Refer to the Journal of Business Logistics (Vol. 36, 2015) study of the factors that lead to successful performance-based logistics projects, Exercise $8.15$ (p. 443). You used the data in the PBL file to test whether commercial suppliers have less experience, on average, than government employees. Due to small samples $\left(n_1=6\right.$ commercial suppliers and $n_2=11$ government employees), the test requires the variance of experience to be the same for the two populations. Set up the null and alternative hypotheses for a formal test of this assumption.

Lobster trap placement. Refer to the Bulletin of Marine Science (April 2010) study of lobster trap placement, Exercise $8.12$ (p. 442). The data are repeated here. You used the small-sample $t$-statistic to form a confidence interval for the difference between the mean trap-spacing measurements of the two fishing cooperatives. This method requires the variance of the population of trap spacings for the BT cooperative, $\left(\sigma_{\mathrm{BT}}\right)^2$, to be the same as the population variance for the PA cooperative, $\left(\sigma_{\mathrm{PA}}\right)^2$. Make the appropriate conclusion using $\alpha=.01$.

Lobster trap placement. Refer to the Bulletin of Marine Science (April 2010) study of lobster trap placement, Exercise $8.12$ (p. 442). The data are repeated here. You used the small-sample $t$-statistic to form a confidence interval for the difference between the mean trap-spacing measurements of the two fishing cooperatives. This method requires the variance of the population of trap spacings for the BT cooperative, $\left(\sigma_{\mathrm{BT}}\right)^2$, to be the same as the population variance for the PA cooperative, $\left(\sigma_{\mathrm{PA}}\right)^2$. Find the approximate $p$-value of the test.