Agroup of statistics students decided to conduct a survey at their university to estimate the average (mean) amount of time students spent studying per week. they sampled 554 students and found a mean of 22.3 hours per week. assuming a population standard deviation of six hours, what is the 95% level of confidence?

Anew obstacle course is home to several new types of challenging obstacles. one such obstacle is traversing a 15-stair staircase. to make it more challenging, the stairs are not uniformly spaced. rather, the vertical space between consecutive stairs for the first 10 stairs is 113 feet and the vertical space for the last 5 stairs is 134 feet. what is the total vertical distance traveled ascending and descending the entire 15-stair staircase?