A researcher wanted to know if the content of television programs has an impact

Question

A researcher 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 nine commercials were inserted into each program. After viewing the program, the viewers 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 a standard deviation of 1.87. The average number of brands recalled for those who saw the neutral program was 4.65 with a standard deviation of 1.67. The conservative degrees of freedom for the t distribution are

A. 107

B. 217

C. 109

Explanation / Answer

Df=sample size for sample 1+ sample size for sample 2-2=108+110-2=216

As option is not here and nearest answer is 217 hence answer is B. 217

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