Unit 3 sample quiz psy2811 Questions And Correct Answers.
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 - 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 - 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 - 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
https://www.stuvia.com/
, e. neither would change - 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 - 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) - 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
d. ScreenPerDay - b. StepsPerDay (need to use Stand. estimate to compare strength)
Based on the regression output, which variables are statistically significantly related to anxiety?
a. Intercept, steps per day, sleep per night
b. steps per day, sleep per night
c. screen time per day
d. sleep per night - b. steps per day, sleep per night. check P values
Why are Dr. Blum's results from the multivariable regression more convincing than the results from
her Pearson correlation table?
a. because using regression she can claim a causal relationship between StepsPerDay and Anxiety
https://www.stuvia.com/
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 - 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 - 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 - 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
https://www.stuvia.com/
, e. neither would change - 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 - 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) - 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
d. ScreenPerDay - b. StepsPerDay (need to use Stand. estimate to compare strength)
Based on the regression output, which variables are statistically significantly related to anxiety?
a. Intercept, steps per day, sleep per night
b. steps per day, sleep per night
c. screen time per day
d. sleep per night - b. steps per day, sleep per night. check P values
Why are Dr. Blum's results from the multivariable regression more convincing than the results from
her Pearson correlation table?
a. because using regression she can claim a causal relationship between StepsPerDay and Anxiety
https://www.stuvia.com/
