do students study less than 150 minutes (2.5 hours), on average, each week? a survey of 51 randomly selected students finds that on average students study 138 minutes per week with a standard deviation of 32 minutes. a hypothesis test based on this data produces a test statistic of -2.68 and a p-value of 0.005. what are the appropriate decision and conclusion at the 5% significance level?

The object would have to be spherical, orbit the sun, and be traveling in a path with other objects.

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's.