researcher has a table of data with 5 column variables and 4 row variables. The value for the degrees of freedom in order to calculate the chi squared statistic is __

And explain how you got it so i can understand future problems : 3

Ineed to know the answer to this algebra question.

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?