A survey was conducted, and a sample of college students was asked about whether they held a part-time job while taking classes. Of those who said "yes," they reported working the following number of hours in the past week. 6, 4, 6, 5, 10 (a) Is the average number of hours worked by the selected students a parameter or a statistic? parameter statistic (b) Calculate the sample standard deviation (in hours) of this data set. (Round your answer to three decimal places.) hr (c) Suppose that this survey was repeated, but that this time, 100 students who worked in the past week reported how many hours they worked. Suppose also that the sample variance of this new sample was 8.94. What is the value of the sample standard deviation (in hours)? (Round your answer to three decimal places.)]