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PSYCH 3500 Assignment1 ANSWERS - Psychology 3500 Statistics...

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Psychology 3500 – Statistics and Research DesignAssignment #1, due Fri 09 September 2016Answer the following questions.Ideally, type your answers into the word processor document; to create figures, either use software like R or Excel tocreate a figure or sketch it and scan the page.Turn in your assignment in BOTH of these TWO WAYS:[1]upload it as a single file (ideally PDF, butword processor formats are also accepted) underAssignmentsin Blackboard, using the filenamenetid_Assignment1.pdfwherenetidis your NetID.(If you disorganize my efforts to grade efficiently by not naming your file in this way then you will lose points and make me sad).[2]Print out yourcompleted assignment and turn in this hardcopy at the START of class on the due date.Please write your name on every physical page in case theyare separated during grading.(1)Consider the following distribution of continuously-valued scores.You can assume that the real limits of thecategories shown reflect the normal practice of your textbook authors.Fill in thecumulative frequencyandcumulativepercentagecolumns.
(2) From the following frequency table of continuously-valued scores and cumulative percentages, use interpolation todetermine the requested percentiles and percentile ranks.Remember real limits!Xc%14-1510012-138410-11728-9486-7324-5102-36(A)What is the percentile rank for x = 5?X = 5 is in 3.5 – 5.5 (4 – 5 bin)
(B)What is the percentile rank for x = 12?
(C)What is the 30thpercentile?
(D)What is the 80thpercentile?
(3)For each of the following data sets, (1) identify whether the data sets are nominal, ordinal, interval, or ratio scaled.(2)Define whether the scores constitute apopulationor asample(to do this, assess whether the goal is to infer a resultabout only the exact group studied or about some larger population meant to be represented by the group studied).(3) Ifthe scores constitute apopulation, define that population.If the scores constitute asample, identify a correspondingpopulationfor which that sample is areasonably fairsample, if any, and explain your choice.1
(A)A data set of the lead levels in public drinking water sources across New York state, in parts per million (ppm), asassessed by a randomized sampling of tap water from several sources within each county of the state.
(B)A data set of all Cornell ROTC cadets, listed by military rank.The intent is to visualize these data to see whether theCornell program has the optimal distribution of ranks to conduct its operations.

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