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  3. Inference for Linear Regression in R

Exercise

p-value

Now that you have created the null sampling distribution, you can use it to find the p-value associated with the original slope statistic from the twins data. Although you might first consider this to be a one-sided research question, instead, use the absolute value function for practice performing two-sided tests on a slope coefficient.

You can calculate the proportion of TRUE values in a logical vector using mean(). For example, given a numeric vector x, the proportion of cases where x is greater than or equal to 10 can be calculated using mean(x >= 10).

Instructions 1/2

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  • Run a linear regression of Foster vs. Biological on the twins dataset.
  • Tidy the result.
  • Filter for rows where term equals "Biological".
  • Use pull() to pull out the estimate column.
  • Use abs() to calculate the absolute value of the slopes.