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Author Question: Consider the following regression analysis for predicting sales per week from intelligence and ... (Read 83 times)

cyc028

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on: Feb 26, 2023

Question 1

Concerning the simple linear regression model, SST can be expressed as:

◦

SSA + SSB + SSE.


◦

SSR + SSE.


◦

SST + SSR.


◦

SST + SSR + SSE.



Question 2

Consider the following regression analysis for predicting sales per week from intelligence and extroversion scores:

​

The regression equation is

Sales/Week = 994 + 8.22 Intelligence + 49.7 Extroversion

​

Term           Coef   SE Coef   T-Value   P-Value

Constant        994       788      1.26     0.224

Intelligence   8.22      7.01      1.17     0.257

Extroversion   49.7      19.6      2.53     0.021

​

S R-sq R-sq(adj) R-sq(pred)

332.069 35.26% 27.65% 10.66%

​

Analysis of Variance

​

Source       DF    Adj SS   Adj MS  F-Value  P-Value

Regression    2   1021166   510583     4.63    0.025

Error        17   1874584   110270

Total        19   2895750

​

What proportion of the variability in sales per week is explained by the model?


◦

0.1066


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0.224


◦

0.3526


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0.021

Introductory Statistics: A Problem-Solving Approach ¦ Kokoska ¦ 3rd Edition
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Marked as best answer by cyc028 on Feb 26, 2023

jbsuccess1

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Reply #1 on: Feb 26, 2023
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cyc028

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Reply 2 on: Feb 26, 2023
Great answer, keep it coming :)

ryansturges

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Reply 3 on: Yesterday
Excellent

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