1.Explain what the t-test results in Figures C12.4 and C12.5 mean, stating an appropriate hypothesis and null hypothesis for each.
2. With regard to Rebecca’s research question, what would you conclude from these results about the importance of distance travelled as opposed to type of vehicle used?
3. Comment on Rebecca’s analysis and the assumptions she has made. What are the implications of this for the validity and reliability of her findings?
4. What data would Rebecca need and what sort of analysis could Rebecca do in order to take her research further as her project tutor suggests, such as seeing how different aspects of the supply chain affect total carbon emissions for different products within that supply chain?