A researcher believes that college students spend less time participating in extra-curricular activities than they did ten years ago. An SRS of 100 college students found that in the past year the mean amount of time spent per semester in extracurricular activities was 107 hours with a standard deviation of 45 hours. Assume that the distribution of hours spent in extracurricular activities is approximately normal. Test the hypothesis that the mean number of hours spent in extracurricular activities has lowered from the value of 120 hours which was the mean time spent in extracurricular activities ten years ago? The null and alternative hypothesis are