A simple random sample of cars in a city was categorized according to fuel type and place of manufacture.

Question

domestic foreign
gasoline 146 191
diesel 18 26
gasoline/ 51 79
electricity hybrid

1. If the two variables were independent, the expected number of foreign gas/electric hybrids would be estimated to be _______.

2. Degrees of freedom =
a) 1
b) 2
c) 4

Answer 1

1. 79/grand total = ?

2. df for what?