McClass

Question

How does the depression severity change (increase/decrease in HDRS score) for every hour of additional sleep?

This is a linear regression.
Report the coefficient for the sleep duration.

Feedback

Waiting for response...

Solution(s)

The system accepts the following correct response(s)

$b = Estimate: r (y) \sim r (x)$

Correctly recognised the problem as a linear regression.
Correctly extracted the $b$ -coefficient for the sleep duration.

Incorrect responses

The system detects the following incorrect responses

$b = \underset{instead of Estimate: r (y) \sim r (x)}{\underset{⏟}{Estimate: r (x) \sim r (y)}}$

Correctly recognised the problem as a linear regression.
The predictor and outcome variable of the model were switched.

$b = Intercept: r (x) \sim r (y)$

Correctly recognised the problem as a linear regression.
Correctly extracted the $b$ -coefficient for the sleep duration.
The intercept was reported.

$b = \underset{instead of Estimate: r (y) \sim r (x)}{\underset{⏟}{Intercept: r (y) \sim r (x)}}$

Correctly recognised the problem as a linear regression.
The predictor and outcome variable of the model were switched.
The intercept was reported.

Traps

Avoid these traps

Make sure to define the correct outcome variable and predictor in the model.
Make sure to report the coefficient of the predictor and not of the intercept.

Question

What is the $p$ -value of the estimate?

This is a linear regression.
Report the $p$ -value for the estimate of the sleep duration.

Feedback

Waiting for response...

Solution(s)

The system accepts the following correct response(s)

$p = Estimate p -value: r (y) \sim r (x)$

Correctly recognised the problem as a linear regression.
Correctly extracted the $p$ -value for the estimate of the sleep duration.

Incorrect responses

The system detects the following incorrect responses

$p = \underset{instead of Estimate p -value: r (y) \sim r (x)}{\underset{⏟}{Intercept p -value: r (x) \sim r (y)}}$

Correctly recognised the problem as a linear regression.
The predictor and outcome variable of the model were switched.
The $p$ -value of the intercept was reported.

$p = Intercept p -value: r (y) \sim r (x)$

Correctly recognised the problem as a linear regression.
Correctly extracted the $p$ -value for the estimate of the sleep duration.
The $p$ -value of the intercept was reported.

$p = \underset{instead of Estimate p -value: r (y) \sim r (x)}{\underset{⏟}{Estimate p -value: r (x) \sim r (y)}}$

Correctly recognised the problem as a linear regression.
The predictor and outcome variable of the model were switched.

Traps

Avoid these traps

Make sure to define the correct outcome variable and predictor in the model.
Make sure to report the $p$ -value for the predictor and not for the intercept.

Sleep and Depression

Question

-1.56

-0.03

6.04

29.68

Question

0.01

0.00

0.00

0.01