Researchers asked each child in a sample of 411 school-age children if they were more or less likely to purchase a lottery ticket at a store if lottery tickets were visible on the counter. The percentage that said that they were more likely to purchase a ticket by grade level are as follows: Grade Percentage that said they were more likely to purchase 6 32.4 8 46.6 10 75.3 12 83.4 Find the equation of the least-squares line, where y = percentage who said they were more likely to purchase and x = grade. (Give the answer to two decimal places.) =
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4 + 46.6 + 75.3 + 83.4 = 237.7 \) - Calculate the sum of xy: \( \sum xy = 6*32.4 + 8*46.6 + 10*75.3 + 12*83.4 = 2318.2 \) - Calculate the sum of x^2: \( \sum x^2 = 6^2 + 8^2 + 10^2 + 12^2 = 344 \) ** Show more…
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