For the mtcars dataset, what is the p-value for the test for the slope of the regression line? fit <- lm(mpg~am, data = mtcars) summary(fit) Hint: Run this code in R. 单项选择题

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The scatter plots below depict the relation between excess returns of two stocks and the market excess return. In each graph,  the market excess return is on the x-axis and the stock excess return is on the y-axis. The dashed line is estimated using a single-variable linear regression and represents the best linear fit:  Which stock has higher R²?

They decide to begin simply by running a model called m1 which has just one predictor variable (temperature) and the outcome variable meatballs. The output of that model is shown below. Coefficients:             Estimate Std. Error t value Pr(>|t|)     (Intercept) 113.7984     7.3137   15.56   <2e-16 *** temperature   8.3263     0.4848   17.17   <2e-16 *** --- Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 Residual standard error: 60.57 on 363 degrees of freedom Multiple R-squared:  0.4483,    Adjusted R-squared:  0.4467  F-statistic: 294.9 on 1 and 363 DF,  p-value: < 2.2e-16 Which of the following best describes the relationship between temperature and meatballs?

Consider the regression model: 𝑦 = 𝛽 0 + 𝛽 1 𝑥 + 𝑢 . Which of the following is correct? 

The regression line suggests that a 1000 points increase in SAT score raises college GPA by ...  

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