A communication researcher randomly assigned 82 volunteers to one of two experimental groups. Sixty dash one were instructed to get their news for a month only from ​ television, and 21 were instructed to get their news for a month only from the Internet. After the month was ​ up , all participants were tested on their knowledge of several political issues. The researcher did not have a prediction as to which news source would make people more knowledgeable. That ​ is , the researcher simply predicted that there is some kind of difference. These were the results of the ​ study: TV ​ group: Mequals 23 ​ , Upper S squaredequals 6 ​ ; Internet ​ group: Mequals 25 ​ , Upper S squaredequals 7 . Using the 0 . 10 ​ level , what should the researcher ​ conclude? Complete parts ​ ( a ) through ​ ( c ) below.
Use the steps of hypothesis testing. Calculate any differences between samples by subtracting values for the Internet group from values for the experimental group. Restate the question as a research hypothesis and a null hypothesis about the populations. Let Population 1 be people who get their news only from television and let Population 2 be people who get their news only from the Internet. The research hypothesis is that the mean test score of people in Population 1 is different from that of people in Population 2 . The null hypothesis is that the mean test score of people in Population 1 is equal to that of people in Population 2 .