Aresearcher wanted to know if the content of television programs has an impact on viewer's recall of ad content. he randomly assigned 108 people to view a program with violent content, and 110 people to view a program with neutral content. the same 9 commercials were inserted into each program. after viewing the program, the subjects were asked to recall the brands advertised in the commercials. the average number of brands recalled for those who saw the violent program was 3.77 with standard deviation 1.87. the average number of brands recalled for those who saw the neutral program was 4.65 with standard deviation 1.67. the standard error for a researcher wanted to know if the content of tele is
a. 0.180
b. 0.058
c. 0.240