Consider the regression model Yi = β0 + β1X1i + β2X2i+ β3X3i + ui.Use "Approach #2" from Section 7.3 to transform the regression so that you can use a t-statistic to test:
β1 = 
Definitions:
Variability
The degree to which scores in a set of data are spread out or differ from each other, indicating the diversity or dispersion within the dataset.
Sampling Distribution
The probability distribution of a given statistic based on a random sample, used to infer properties of an entire population.
Population Mean
The average of all the values in a population.
Sampling Distribution
The distribution of a statistic (such as the mean) computed from a sample, over repeated sampling from the same population.
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