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Out of the given statements, the true statements are:
1. There is no correlation between happiness and income.
2. The line of best fit would have a positive slope, representing as income goes up, happiness goes up.
3. The slope of the line of best fit could be around m = -1/2000.
4. The y-intercept of the line of best fit would show a happiness score of around 40 when there is $0 income.