Refer to the sales-appraisal simple linear regression in previous examples. Find a 95% confidence interval for the mean monthly sales when the appliance store spends $400 on advertising.

Previous example

Calculate the coefficient of determination for the advertising-sales example.

Obtaining the Value of The data are repeated in Table 11.4 for convenience. Interpret the result.

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Table 11.4 Advertising-Sales Data Advertising Expenditure, x ($100s) 12345 2 Sales Revenue, y ($1,000s) 11224