Spending on cre cards decreases ter hearis maz spencing season as measured b ano

Question

Spending on cre cards decreases ter hearis maz spencing season as measured b ano nt charged on a credit card in December. The Cick thr conto view the monthly tedt card charges. a) Hiilt1a fegra sinn ma pradid January spending tam r]hcAmhar's penning an-120 6483+0.6997 Dec Round to faur decmal places as needed Check the conditicns for this madel. Salect all the true tents re:ted ta checking the candtions. yng dat sct contsinsthe monthly cre t card charges ofa random sam pe o 99 car c dan en ports thro ch c, belo ccor om A.All of the conitions re defnitely salielied B. The Nearly Nomal Condition is net satoficd. D. The Ecual Spread Conditon is nut satisied Tha uneartty. Contion s not satisnad E. 1519.95 Round to the nearet cant as neaded c Give 95% conficence interval for the averageJanary charges of carcholders whe charged 2000 in Dscember 1300.58709.34 to the nearest centa needed. e)What reservatios, if ay would a researcher have about the confidence intervals made in parts cand di? Select all that apply. L B. The data are nct linear, so the conidence intenvals are not valid. C. I harasiduals show increasing spraad, so tha contanca rtervals may not ba vald . A researcher would not h veany reservations. The confidence itenals re vald.

Explanation / Answer

The correct answer is

[C] Since the spreads are increasing this wouldimply that the data are not homoscedastic

[D] Also since we are regressing on the previous time data thus the assumption of independence of the error term and the predictor variable will not hold.

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