K300 Statistics, Prof. Kruschke

Homework 6, Due at the beginning of class, Tuesday Mar. 8, 2005.

Be sure to

  • write your name and ID on every page
  • make a copy of your homework for your own records and exam study
  • staple (not paper clip) your pages
  • write clearly
  • show your work as appropriate -- an unannotated sequence of numbers and derivations that mysteriously ends up with the correct numerical answer will not be given full credit
  • answer every part of every question (unless instructed otherwise).
    1. 4 pts. P. 252, #13. Do not do part (c).
    2. 4 pts. p. 253, #16. Do not do part (c).
    3. 4 pts. p. 253, #17. Do not do part (c).
    4. 2 pts. p. 254, #19. Hints: S is the sqrt of S2 in Eqn. 8-1, p. 221. See p. 240.
    5. 3 pts. p. 254, #20, (a)-(f), that is, not (g). Hint: See Table 8-8, p. 241.
    6. 3 pts. p. 254, #21. Hint: See Table 8-9, p. 242.
    7. 5 pts. Rosenberg Workbook 6-1. Read through the sheets, and then do the exercise on the sheet "experiment". Print out the first page of the "experiment" sheet, such that your Sample 3 and Sample 4 are shown, along with the average, stdevp and stdev of your samples. Make sure to answer the question of which is closer to the true SD!
    8. There are three Excel workbooks in the Group Space of Oncourse that begin with K300HW6_... Get them and open them in Excel. Carefully follow the instructions in each one and then do the following: First do the workbook with "_Neq4_" in the name, then "_Neq9_", and then finally "_nonnormal". For each one, print out only the graph of the sampling distribution and the last page, showing the percentiles and critical values in the sampling distribution. (No need to waste a lot of trees!) Keep them collated, in order.
      A. 9 pts. On the print outs of the three "SamplingAttributes" pages, neatly write answers to the three Stop and Think questions. Hopefully you can find space on your piece of paper; if not, attach an extra sheet with clear indications of which questions you're answering.
      B. 6 pts. On the print outs of the sampling distributions, clearly mark the locations the 2.5th %ile and the 97.5th %ile (which are computed on the SamplingAttributes sheet). If they lie off the edge of the graph, indicate that, with their approximate locations.