The National Opinion Research Center polled a sample of 92 people aged 1822 in the year 2002, asking them how many hours per week they spent on the internet. The sample mean was 7.38, with a sample standard deviation of 12.83. A second sample of 123 people aged 1822 was taken in the year 2004. For this sample, the mean was 8.20 with a standard deviation of 9.84. Can you conclude that the mean number of hours per week increased between 2002 and 2004?

Statistics: Ch. 1 Important Definitions • Statistics—Numerical description of data • Population—A set of all subjects or elements about which we are interested in making inferences • Frame—A list containing all members of a population o Very expensive to make, would just be names • Census—Data that’s gathered from the entire population o Things like average income, number of children et cetera • Parameters—Population parameters are facts abo