# PSYCH 3500 Assignment1 ANSWERS - Psychology 3500 Statistics...

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(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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Term
Summer
Professor
SSPECHT,S
Tags
a Strength