From the population of all Woodlands University students, we draw a sample of 144 students to estimate the mean number of hours that students spend “on the internet” each week. (In other words, the total number of hours spent online, counting social media, on any device during the course of a seven-day week). We discover that in the sample the mean is 35 hours, with a standard deviation of 10 hours.

a) What is the standard error? ___________________________________________ (show calculation)

b) If we increased our sample size to 225, would the standard error increase, decrease, or stay the same? __________________

c) The standard error represents ______________ (word referring to a concept) in sample results.