N=695 F= 27.2 (p<0.001), R2= 0.43 A researcher is interested in using the follow
ID: 3269418 • Letter: N
Question
N=695 F= 27.2 (p<0.001), R2= 0.43
A researcher is interested in using the following independent (predictor) variables to predict if a group intervention reduces depreswsion in pre-operative surgical patients. The researcher selects critical alpha = 0.05 and operationally defines the variable as follows: Dependent variable; scale 1 to 10 ( normally distributed); 1 = no depression and 10= highest depression. Independent variables: Group; 0= control group and 1 = experimental group Age; number of years Gender; 0= male and 1 = female Smoking; 0= non-smoker Marital Status; 0= unmarried and 1= married
N=695 F= 27.2 (p<0.001), R2= 0.43
PART 1. wHICH OF THE FOLLOWING STATEMENTS IS TRUE? PLEASE EXPLAIN
a. For each unit increase in gender, depression increases by a factor of .025
b. for each increase in marital status, there is a significant interaction with depression
c.for each unit increase in age, depression score is expected todecrease by .017 units when other independent variables are controlled
d. for each increase in age, depression score will increase by .017 units whenother independent variables are controlled
coefficient Unstandardized Coefficient Standardized Coefficeint B Standard Error Beta t SIg Constant 8.364 .253 33.038 .000 Subject age -0.17 .007 -0.96 -2.568 .010 gender 113 146 .025 770 .442 smoking recorded -989. .262 -.133 -3.777 000 marital status .315 .167 .071 1.881 .060 group 3.051 .154 .690 19.853 000Explanation / Answer
Answer:
Unstandardized Coefficient
Standardized Coefficeint
B
Standard Error
Beta
t
SIg
Constant
8.364
.253
33.038
.000
Subject age
-0.17
.007
-0.96
-2.568
.010
gender
113
146
.025
770
.442
smoking recorded
-989.
.262
-.133
-3.777
000
marital status
.315
.167
.071
1.881
.060
group
3.051
.154
.690
19.853
000
A researcher is interested in using the following independent (predictor) variables to predict if a group intervention reduces depreswsion in pre-operative surgical patients. The researcher selects critical alpha = 0.05 and operationally defines the variable as follows: Dependent variable; scale 1 to 10 ( normally distributed); 1 = no depression and 10= highest depression. Independent variables: Group; 0= control group and 1 = experimental group Age; number of years Gender; 0= male and 1 = female Smoking; 0= non-smoker Marital Status; 0= unmarried and 1= married
N=695 F= 27.2 (p<0.001), R2= 0.43
PART 1. wHICH OF THE FOLLOWING STATEMENTS IS TRUE? PLEASE EXPLAIN
a. For each unit increase in gender, depression increases by a factor of .025
False. when the person is female, his depression score is expected to increase by 113 units when other independent variables are controlled
b. for each increase in marital status, there is a significant interaction with depression
False. Marital status is not significant ( P=0.060). when the person is married, his depression score is expected to decrease by .315 units when other independent variables are controlled.
c.for each unit increase in age, depression score is expected to decrease by .017 units when other independent variables are controlled. ( the coefficient s negative).
True: For each unit increase in age, depression score is expected to decrease by .017 units when other independent variables are controlled
d. for each increase in age, depression score will increase by .017 units when other independent variables are controlled
False. For one year increase in age, depression score will decrease by .017 units when other independent variables are controlled. ( the coefficient s negative)
Unstandardized Coefficient
Standardized Coefficeint
B
Standard Error
Beta
t
SIg
Constant
8.364
.253
33.038
.000
Subject age
-0.17
.007
-0.96
-2.568
.010
gender
113
146
.025
770
.442
smoking recorded
-989.
.262
-.133
-3.777
000
marital status
.315
.167
.071
1.881
.060
group
3.051
.154
.690
19.853
000
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