Problem 2: The fuel economy (in km/L) of two types of car engines were measured by testing 25 trials for each. The sample mean and standard deviation for engine 1 was x₁14.5 and s₁ = 0.6, and for engine 2, x₂ =15.5 and $₂ $1 1.2. = a) What appropriate hypotheses should be used to test whether engine 2 provides higher fuel economy than engine 1? b) Is there evidence to support the claim that engine 2 has a higher fuel economy than engine 1? Use a = 0.05, and assume that both populations are normally distributed but the variances are not equal.

Expression, rule, or law that gives the relationship between an independent variable and dependent variable. Some important types of functions are injective function, surjective function, polynomial function, and inverse function.