Unit 3 sample quiz psy2811 || Errorless Answers 100%.

Unit 3 sample quiz psy2811 || Errorless Answers 100%.


in the linear regression equation, Y=bx + a, what is the value of b called?
a. correlation between X and Y
b. beta (slope)
c. Y intercept
d. X intercept
e. standard error of estimate correct answers b. beta (slope)


for the linear regression equation, Y = bx + a, which of the following X,Y points will be on the
regression line?
a. b, a
b. a, b
c. 0, b
d. 0, a
e. none of the above correct answers D. 0,a


If there is a negative correlation between X and Y then the linear regression equation Y = bX + a,
would necessarily have:
a. b<0
b. a<0
c. a>0
d. b>0
e. a=b=0 correct answers a. b<0


In Figure 4 at the right, if the data point (X=2, Y=16) is added, the beta will _______ and the
intercept will _______.
y= 0.87x + 10.05

, a. increase; increase
b. decrease; decrease
c. increase; decrease
d. decrease; increase
e. neither would change correct answers d. decrease, increase


In Figure 4, the data point (X=7, Y=12) is ___________ the predicted Y based on the regression
line.
Y = 0.87x + 10.05
a. above
b. below
c. equal to
d. the square of
e. the square root of correct answers b. below


Which variable is most strongly correlated with Anxiety?
a. StepsPerDay (r= -0.881)
b. SleepPerNight (r=.-0.843)
c. ScreenPerDay (r=0.551)
d. StepsPerDay and ScreenPerDay have the same strength of correlation (p<.001) correct
answers a. stepsperday


When all the variables are entered into a multivariable linear regression, now what variable is the
strongest predictor of Anxiety?
a. Intercept
b. StepsPerDay
c. SleepPerNight