Question

In: Statistics and Probability

Are any variables not useful predictors of home price at a significance level of α =...

  1. Are any variables not useful predictors of home price at a significance level of α = 0.05? State the P-values of these variables. Intuitively, what does this mean with respect to pricing properties? (Show your results)                                                    (8 Points)
df SS MS F Significance F
Regression 8 4.6E+12 5.75E+11 65.04884 7.3335E-50
Residual 186 1.64E+12 8.84E+09
Total 194 6.25E+12
Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Lower 95.0% Upper 95.0%
Intercept 184455.9 44755.82 4.121383 5.67E-05 96161.5757 272750.1 96161.58 272750.1
Bedrooms -42156.8 14102.62 -2.98929 0.003174 -69978.485 -14335.2 -69978.5 -14335.2
Baths 48275.15 14519.24 3.324909 0.001065 19631.589 76918.71 19631.59 76918.71
Stories -46864.8 16399.42 -2.85771 0.004753 -79217.601 -14512.1 -79217.6 -14512.1
Square Footage 172.5225 15.1501 11.38755 3.91E-23 142.634415 202.4106 142.6344 202.4106
Age -3646.92 1039.317 -3.50895 0.000564 -5697.2796 -1596.55 -5697.28 -1596.55
Fenced Yard -6501.07 18095.55 -0.35926 0.719806 -42199.968 29197.83 -42200 29197.83
Golf Course? 48143.84 16068 2.996256 0.003106 16444.8926 79842.8 16444.89 79842.8
Number of Fireplaces 34327.63 18036.59 1.903222 0.058556 -1254.9598 69910.23 -1254.96 69910.23

Solutions

Expert Solution

Regression eq is

home price=184455.9-42156.8*Bedrooms+48275.15*Baths-46864.8*stories+172.5225*square footage-3646.92*age-6501.07*Fenced yard+48143.84*golf course+34327.63*Number of fireplaces

if p>0.05 such variables are not useful predictors

For Fenced Yard ,p=0.719806,p>0.05

Fenced Yard is not a significant variable in predicting  home price.

For Number of Fireplaces,p=0.058556,p>0.05

Number of Fireplaces is  not a significant variable in predicting  home price.

But from Global F test

F=65.04884,p=0.0000

p<0.05

Reject Ho

Accept Ha

Atleast one the coeffcients of predictors is different from zero

overall regression model is significant

we can use this model to predict home price


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