A sample of part time students are asked how many hours per week they work on a job. For the following sample data: 18 13 12 15 12  a. what is the point estimate of μ? b. what are the boundaries of the 99% confidence interval for μ?  hint 1: this problem only asks for parameter estimation of this unknown population of student work hours. So you just need to decide is this a Z test situation or t-test situation (by seeing if population standard deviation is provided or not?) if a t-test situation, what kind of t-test? It looks like only 1 sample is given to you, so it's pretty obvious... hint 2: this is a raw dataset, so you'll need to figure out SS from scratch, which is ∑(x−M)2

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