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Several studies have found that the frequency with which shoppers browse Internet retailers is related to the frequency with which they actually purchase products and/or services online. Here are data showing the age of respondents and their answer to the question "how many minutes do you browse online retailers per week?"

a) Write the equation of the regression line.

b) Find the value of the correlation and test whether the true correlation is zero. Is there evidence of an association between CO2 level and global temperature?

c) Find the t-value and P-value for the slope. Is there evidence of an association between CO2 level and global tem- perature? What do you know from the slope and t-test that you might not have known from testing the correlation?

d) Do you think predictions made by this regression will be very accurate? Explain.

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