Example 8f. Larvae of some monarch butterflies concentrate cardiac glycosides from milkweed plants. This makes the butterflies unpalatable to birds. Butterflies have been randomly selected in one location and their glycoside concentrations X measured relative to their dried weight. Summary data: x = 0.200, S = 0.012, n = 10. Let u be the mean glycoside concentration of these butterflies. Test the hypothesis that u is 0.150 against the alternative that it is not. Assume normality of concentrations.