Market Researchers have become more interested in the potential of social networking sites. But they need to understand the demographics of social networking users. A recent survey showed that 22 of the 30 respondents who reported earning less than $30,000 per year said that they were social networking users. The mean salary of the 22 respondents was $21,500 with a standard deviation of $200. On the other hand, 20 of the 30 respondents who reported earning more than $70,000 per year said that they were social networking users. The mean salary of the 20 respondents was $90,000 with a standard deviation of $300. (a) Is there is enough evidence to infer that those who reported earning less than $30,000 per year are more likely to be social networking users? Assume that the level of significance is 2.5%.
Market Researchers have become more interested in the potential of social networking sites. But
they need to understand the demographics of social networking users. A recent survey showed that
22 of the 30 respondents who reported earning less than $30,000 per year said that they were
social networking users. The mean salary of the 22 respondents was $21,500 with a standard
deviation of $200. On the other hand, 20 of the 30 respondents who reported earning more than
$70,000 per year said that they were social networking users. The mean salary of the 20
respondents was $90,000 with a standard deviation of $300.
(a) Is there is enough evidence to infer that those who reported earning less than $30,000 per year
are more likely to be social networking users? Assume that the level of significance is 2.5%.
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