A personnel director in a particular state claims that the mean annual income is greater in one of the​ state's counties​ (county A) than it is in another county​ (county B). In County​ A, a random...

A personnel director in a particular state claims that the mean annual income is greater in one of the​ state's counties​ (county A) than it is in another county​ (county B). In County​ A, a random sample of 18 residents has a mean annual income of $41,900 and a standard deviation of $8600. In County​ B, a random sample of 8 residents has a mean annual income of $39,100 and a standard deviation of $5900. At a= 0.10​, assume the population variances are not equal.

Enter the critical​ value(s) below: