Question

A person reads that the average number of hours an adult sleeps on a Friday night was 7.2 hours. The researcher feels that college students do not sleep 7.2 hours on average. The researcher randomly selected 15 students and found that they slept on an average of 8.3 hours with a standard deviation of 1.2 hours. At a level of significance of .05 is there enough evidence to say that college students do not sleep 7.2 hours on average?

Answer 1

yes because he did a controlled experiment to find out how much time average