please explain and calculate each answer in detail please, also can you resize t
ID: 3311558 • Letter: P
Question
please explain and calculate each answer in detail please, also can you resize this image so you can read it.
1 Multiple Choice Problem Ther's ony one right choice in each prodiem. Please choose the right one in your mind. a) , " 26230500 measures the dange In E(s) for every 1-unit inerette in X; b) there Rssufficient ervidence of conrase upward (urvature when usin& 0.05; e) The oneall model i.at lieful at -001 fur predicting the loss. Y d) none of the above, The Journal of Agricutual, Biological, ad Environmental Statistics March 2000) presnted a stady of the chemical compoeition of rain wa- ter. The nitrate concentration, y (milligrams per liter), in rain water sample was modeled finction of two independent variables: water source groundwater, subsurface flow, or overground ow and talica con, centration (milligrams per liter) L. Whats the leved of the qualitative indepede variable froan above desaription a W ch one ar L Ibri anurme lHtL:isril stepwise rognssion prep dure? n) It inm18tarting with no' arialle in the modul, adding thv varishle (if any) whose iselisin gives the most significat t-value·ind repeating this proosa until nome improves the model to a statietically significant extent, b). It ivlx starting with all eaxliclate vari,deleting the: variable any) with the mallst t or F statistic for testing 130 :»Dis identified nd dropped frum the me i tet isb thanee apeciived eritical value, and repeating thbs process until no bwther onsiguificant dependest varlables can be Sound c).3 e (0,oo) 2. How many dummy wariables needs to be built for ta·qualitative variable? b).2 d1.4 . It ine1TB starting with no varinhles in the model, building model by suo- ossively felding variable, and fvchoking the t-valws oresponding to the sea that have eturd the model in aa earlier ste, relacing the variabsthat wed 2 Free response problems In order to get credits, you need to show your procedures for these problems I. The rearchers eanployed mltiple regrssion to model a bullying victims intention to leave the firm (y)as function o level of hullying (measured on a 50-point scale) b2 3 d)4 of the and perocived orgnnivational supportmeasurod alow, neutral, or high) An example of quadratie regression in PROC GLM sollows. These data are taken from Draper and Smith (1066, p. 57)- Thirteen specimens of 90/10 Ca-Ni alloys are tested in a corrosion-wheel setup in onder to examine corrosion. Each pecimen has a certain iron content, The wheel is rotated in salt se water at 30 ft/sec for 0 das, Weight los is used to quantif the corroston. The (X) variable represents the iron content, and the loss variabke desotes the wiht s Y in milligrams/sqeare decimeteray. The qaadratic regresion model is a) Write a complcte sccond-order model for E(y) as a function o the independent (b) In terms of tbe in the model, part a, give the mean value of intention to eave for a victim who reports a ballying level of 25 points and who peroives orga nizstional support as kw (c) How would you test whether the terms in the model that allow for a curvilinear relationship botwoen intent to lkave and kvel of bullying are statistically ustu? Te SAS ouput i illustrated in the fig. Bidoth outpat, answer question4 (d) Write at first-order model for E(y)a8 function ofthe independent vurialles that incorporates interaction (c) Write a main cfct moel for Ely) as a function of only the qualitative variahle Cependestvwiatle loss (f) Refer to the model, part e. Explain the meaning of each in the model. 26 539 2. Many wurkcns sutfer from stress and chronie insomnia. Is insomnia related to e cation status? Aduls ivingin Tenpcasee wcre selected to participate in the stady using aandom-digit telephone dinling procedure In addition to insomnia sta- tus (normal sleeper or chronic insomnin), the rsearchers classified each participant into one of four education categories (oollege graduate, some college, high school graduate, and high school dropout). The dependent variable (y) of interest to the restarcbers was a quautitative measure of daytime functioning called the Faligue Severity Scale (FSS), with values ranging from 0 to 5. a) What is the main effect modelor Ely) as a function ofisonnia status and exiucation level b) What is a interaction model or Ey)as a functioonia status and edu e) The researchers disoovered that the mean FSS for peaple with chronic insonia is greater than the mcan S for oal sleepens, but that this ditfereis the same at all education leves Based on this rslt, which of the two models hest represents the data?Explanation / Answer
Answer to the question)
Answer to question#1 )
the qualitative independent variable is : Source of water
there are three possible sources of water
the level of this variable is : 3
.
Answer to question#2 )
Since there are three levels , so we would require 3 dummy variables for each level
Groudwater - 0
Subsurface - 1
overgroud - 2
thus for each of the levels the assigned dummy variables are : 0,1,2
hence 3 variables are used
.
Answer to question# 3 )
Nesting pairs appear when the same pair appears with additional variable
like this we get 3 nested pairs
.
Answer to question# 4)
The statement first is correct , and the slope Beta 1 tells us about the change is y caused due to a unit change in x1
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.