1. You have the following random samples containing information on annual income (measured in thousands) and marital status for individuals living in urban and rural areas.

Urban annual income	Urban Married	Rural annual income	Rural Married
33	Yes	22	Yes
56	Yes	81	Yes
88	No	19	No
43	No	26	Yes
28	Yes	38	Yes
42	Yes	101	No
105	No	31	Yes
90	Yes	29	No
21	Yes	35	Yes
47	No	39	Yes
57	No	66	Yes
19	No	99	No
118	Yes	18	Yes
77	Yes	92	Yes
50	Yes	65	Yes
31	No	48	No

The samples have the following standard deviations: