The National Opinion Research Center polled a sample of 92 people aged 18-22 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 18-22 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?

1.1 - Population, Sample, and Procedures Monday, August 28, 2017 7:00 PM Population an investigation will typically focus on a well-defined collection of objects constituting a number of interests Census what desired information is available for all objects in the population Sample a subset of the population that is selected...