I am using x to predict y. When I know the value of x, the mean-squared-error of my estimate of y is less than when I don't know x. - answer-x explains some of the variance in y
If the SSmodel is greater than the SSresidual... - answer-the model accounts for more than 50% of the total variance
...
I am using x to predict y. When I know the value of x, the mean-squared-error of my
estimate of y is less than when I don't know x. - answer-x explains some of the
variance in y
If the SSmodel is greater than the SSresidual... - answer-the model accounts for
more than 50% of the total variance
What is the coefficient of determination? - answer-The proportion of variance
accounted for in the dependent variable by the predictor variables.
What is the relationship between r and beta in a simple regression? - answer-beta is
an unstandardised measure of r
What is the critical value for t with 5 degrees of freedom and an alpha of 0.05 two-
tailed? Give your answer to 2 decimal places. - answer-2.57
You have the following data:
x = c(10,3,2,1,3,4,5,6)
y = c(2,14,18,12,10,11,8,9)
You run a linear model and get the following estimate of the slope:
^B1 = -1.423
What is the standardised beta? Report to 2 decimal place - answer--0.86
If I have a lot of error in my regression model, it means that: - answer-There are big
differences between the line specified by my model and the corresponding points on
the scatterplot.
If the beta for your x term in a regression model is negative, it means: - answer-That
there as x increases, y decreases.
I conduct a study to investigate whether average hours of sleep per nigh (x) predicts
sick days per year (y). I find the follow values for the intercept and slope:
CONT +
,CWP test with 100% correct answers
2024
B0 = 25
B1 = -1.6
True or false, the following is the correct interpretation of the intercept:
A person who sleeps 0 hours on average per night is expected to have 24 sick days
per year. - answer-False
I conduct a study to investigate whether average hours of sleep per nigh (x) predicts
sick days per year (y). I find the follow values for the intercept and slope:
B0 = 25
B1 = -1.6
True or false, the following is the correct interpretation of the slope:
For every hour of sleep a person has on average per night, the number of sick days
per year decreases by 1.6 days. - answer-True
What is the critical value for t with 5 degrees of freedom and an alpha of 0.01 two-
tailed? Give your answer to 2 decimal places in the form X.XX - answer-4.03
You run a linear model with a single binary predictor. The intercept for the model is
110, and the unstandardized beta is 17.1. What is the mean of the group coded 1? -
answer-127.1
You run a linear model with a single binary predictor (0 = Group0; 1 = Group1). The
mean of Group1 is 75 and the beta coefficient is 7. What is the value of the
intercept? - answer-68
If regression model errors (residuals), show different amounts of variation across the
range of measurement, they are referred to as ... - answer-Heteroscedastic
Match the assumption/diagnostic to the most appropriate test.
Shapiro-Wilk Test - answer-Normality of residuals
CONT +
, CWP test with 100% correct answers
2024
Match the assumption/diagnostic to the most appropriate test.
Durbin-Watson Test - answer-Autocorrelation of residuals
Match the assumption/diagnostic to the most appropriate test.
Non-constant variance test - answer-Heteroscedasticity
Match the assumption/diagnostic to the most appropriate visualization.
Histogram - answer-Normality of residuals
Match the assumption/diagnostic to the most appropriate visualization.
Scatterplot - answer-Linearity
Match the assumption/diagnostic to the most appropriate visualization.
The null hypothesis for the non-constant variance test (Breusch-Pagan test) is that
the data are heteroscedastic.
True or False? - answer-False
What are the degrees of freedom for the sums of squares total in a linear model? -
answer-n-1
Which R function can be used to calculate from a model object? - answer-predict()
In a simple linear model where both variables are continuous and z-scored, what is
the value of the intercept? - answer-0
The null hypothesis for the non-constant variance test (Breusch-Pagan test) is that
the data are heteroscedastic. True or false? - answer-False
CONT +
Voordelen van het kopen van samenvattingen bij Stuvia op een rij:
Verzekerd van kwaliteit door reviews
Stuvia-klanten hebben meer dan 700.000 samenvattingen beoordeeld. Zo weet je zeker dat je de beste documenten koopt!
Snel en makkelijk kopen
Je betaalt supersnel en eenmalig met iDeal, creditcard of Stuvia-tegoed voor de samenvatting. Zonder lidmaatschap.
Focus op de essentie
Samenvattingen worden geschreven voor en door anderen. Daarom zijn de samenvattingen altijd betrouwbaar en actueel. Zo kom je snel tot de kern!
Veelgestelde vragen
Wat krijg ik als ik dit document koop?
Je krijgt een PDF, die direct beschikbaar is na je aankoop. Het gekochte document is altijd, overal en oneindig toegankelijk via je profiel.
Tevredenheidsgarantie: hoe werkt dat?
Onze tevredenheidsgarantie zorgt ervoor dat je altijd een studiedocument vindt dat goed bij je past. Je vult een formulier in en onze klantenservice regelt de rest.
Van wie koop ik deze samenvatting?
Stuvia is een marktplaats, je koop dit document dus niet van ons, maar van verkoper njorogeantony870. Stuvia faciliteert de betaling aan de verkoper.
Zit ik meteen vast aan een abonnement?
Nee, je koopt alleen deze samenvatting voor €7,56. Je zit daarna nergens aan vast.
