Assuming that both groups are normally distributed and have equal population variances, over the next several questions conduct a hypothesis test to see if cat owners spend less than dog owners on veterinary bills per year.

Note that SE x1-x2 = 5.9

	Mean vet expense/year ($)	mean vet expense	Std. Dev. ($)	Sample size
	Households with 1 dog only	356	24.2	30
	Households with 1 cat only	340	18.5	25

State the null and alternative hypotheses

Calculate the test statistic

Calculate critical value