econometrics problem on testing at 5% significance level, economics homework help

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It's an econometrics problem on testing at 5% significance level

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3. A study of vacation expenditures in relation to income was based on data for 256 households, which were grouped into three separate income classes. Log linear regressions (with an intercept) were computed for each group and for all households with the following results: Household Regression Residual Number of Income slope (B) variance (s) households (n) Low income 0.02 0.26 102 Middle income 0.09 0.42 102 High income 0.14 0.30 52 All households 0.07 0.38 256 (a) Test whether the expenditure function is the same for all income groups at the 5% significance level. (Be careful about the degrees of freedom for your test statistic.) (b) Given that the sample variance of the log income in the complete sample is 24, test the hypothesis that the expenditure elasticity for all households is 0.10 at the 5% significance level.
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