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¡¥00. Discuss whether you can measure the causal effect of ¡®Income¡¯ on ¡®Airline Travel.¡¯ Suppose that the true variance of the error term is known as. Test the following null and alternative at the 5% significance level. The null is that the true slope parameter is 0.4 and the alternative is that the true slope parameter is not 0.4. [Hint: approximately¡¦
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