how do you compute test statistic

A pet association claims that the mean annual cost of food for dogs and cats are the same. The results for samples for the two types of pets are shown below. At a=0.10, can you reject the pet association's claim? Assume the population variances are not equal. Assume the samples are random and independent, and the populations are normally distributed. Complete parts (a) through (e) below. Dogs Cats = $256 = $221 57 = $38 n1 18 12 = 8 The null hypothesis, Ho O The alternative hypothesis, He (b) Find the critical value(s) and identify the rejection region(s). Enter the critical value(s) below. - 1.895, 1.895 (Type an integer or decimal rounded to three decimal places as needed. Use a comma to separate answers as needed.) Select the correct rejection region(s) below. O A. t> to B. t to O c. - to