What is the estimate standard error for the distribution of sample mean for this scenario?

How Much Are College Students Sleeping? Scenario: Americans average 6.9 hours of sleep on weeknights, according to a report released in 2011 by the National Sleep Foundation. A student in a statistics class at Los Medanos College wondered if the average amount of sleep on weeknights is different for LMC students. She plans to test her hypotheses at a 5% level of significance. She collects data from a survey of 43 randomly selected students at LMC. Respondents averaged 7.12 hours of sleep a night with a standard deviation of 1.45 hours