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Practice Exams Vol 2. - Exam 1PM

Hi,
Anybody else having done this set? I dont understand the explanations to a few of the questions:
Question 67:

The null hypothesis associated with each of the t-statistics reported for the slope estimates in Table 1 is: Ho: slope = zero. So, the standard error equals the slope estimate divided by its t-statistic: 0.1000 / 2.85 = 0.035.
..
0.2000

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