A science student is undertaking an early stage investigation into the possible effect of a food additive on the weight of rats. The additive is a designer chemical aimed at increasing growth rate.
Additive Standard
134 70
146 118
104 101
119 85
124 107
161 132
107 94
83 113 129 97 123 Use µa and µs to denote the population mean weight of rats for the respective populations from which the samples Additive and Standard came. State the null and alternative hypotheses (i.e. H0 and H1) to test if there is evidence that the additive has increased the weight of rats. Explain why you chose H0 and H1 in the way that you did (e.g., why did you choose a hypothesis to be H0 and not H1?)