Question

An ecenemist is studying the 1eb market in Denver area neichborhoods. Let x represent the total number aobs in a oven neighborhood, and let y represent the number of ertry-leves jobs in the same neighcorhood. A sampet sx Denwer neschborhoods gave the toilowing intormation (units in huncreds ofobs. a) Draw a seater dagram displaying the dats Flash Payer 0 or higher s required for You can get Rlash Player tree from Adobe's website. t) Verty the gven tumsrx, Ζν. D2M2, Ery, and tte van af the tar pte corrlation cetfident r, (Round your vatn trrtoerce do mal plann.) 2y (c Pind x, and men find the aua ond, the least saares ine9-аャa und your answers for x andytotodeanu paces Rund your ans es for a ansutnee dec m려 places. (d) Graph the least-squares line. Be sure to plat the pontas a point on the line 1 20 3400 120 0 405080 20 0 405080 n) Prd tte val n of the e mont of determinat r , what pe antaga c the vanaton in yar, be egan dbyt c r spring variation nrare the ︼ tan sine? what tagn is um aned? Ra dyrarm er r_tthme deci al la es. Rond your answers fr t ต pe certa sto eder s wthx-33 hunered jobs, how many are predictoe to be entry level jobst (Round your answer to bwo decimal places)

Answer 1

b)

$\sum$x =199

$\sum$y=28

$\sum$x²=7565

$\sum$y²=158

$\sum$xy=1053

r=0.766

c)

xbar=33.17

ybar=4.67

yhat=0.393+0.129x

d)

top left plot is correct

e)

r² =0.586

explained =58.6%

unexplained=41.4%

r)

predicted value =0.393+0.129*33=4.65