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A researcher wanted to know if the content of television programs has an impact on viewer's...

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 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.

1) What is the conservative degrees of freedom for the t distribution to be used?

2) Given the available degrees of freedom on our table, what df will we use?

3) Calculate the test statistic

4) Find the p-value

5) Find the 90% confidence interval for the difference between the average number of commercials remembered between the two groups  

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