Chapter 16 Homework and Quiz with correct answers 2024.
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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. - answers-x explains some of the variance in y
If the SSmodel is greater than the SSresidual... - answers-the model accounts for more than 50% of the total variance...
Chapter 16 Homework and Quiz with
correct answers 2024
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. - answers-x explains some of the variance in y
If the SSmodel is greater than the SSresidual... - answers-the model accounts for more than
50% of the total variance
What is the coefficient of determination? - answers-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? - answers-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. - answers-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:
CONT +
,Chapter 16 Homework and Quiz with
correct answers 2024
^B1 = -1.423
What is the standardised beta? Report to 2 decimal place - answers--0.86
If I have a lot of error in my regression model, it means that: - answers-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: - answers-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:
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. - answers-False
CONT +
,Chapter 16 Homework and Quiz with
correct answers 2024
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. - answers-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 - answers-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? - answers-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? - answers-68
CONT +
, Chapter 16 Homework and Quiz with
correct answers 2024
If regression model errors (residuals), show different amounts of variation across the range
of measurement, they are referred to as ... - answers-Heteroscedastic
Match the assumption/diagnostic to the most appropriate test.
Shapiro-Wilk Test - answers-Normality of residuals
Match the assumption/diagnostic to the most appropriate test.
Durbin-Watson Test - answers-Autocorrelation of residuals
Match the assumption/diagnostic to the most appropriate test.
Non-constant variance test - answers-Heteroscedasticity
Match the assumption/diagnostic to the most appropriate visualization.
Histogram - answers-Normality of residuals
CONT +
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