Question

The following table contains the advertising cost and average daily sales for a random sample of...

The following table contains the advertising cost and average daily sales for a random sample of ten months at a local fruit stand.

Month Monthly Advertising ($) Avg. Daily Sales ($) x² y² xy
1 120.58 231.69 14539.5364 53680.2561 27937.1802
2 143.00 291.78 20449 85135.5684 41724.54
3 108.91 240.70 11861.3881 57936.49 26214.637
4 130.41 264.80 17006.7681 70119.04 34532.568
5 115.14 264.16 13257.2196 69780.5056 30415.3824
6 107.54 224.35 11564.8516 50332.9225 24126.599
7 132.81 275.14 17638.4961 75702.0196 36541.3434
8 118.95 252.53 14149.1025 63771.4009 30038.4435
9 128.33 260.73 16468.5889 67980.1329 33459.4809
10 138.85 268.63 19279.3225 72162.0769 37299.2755
Σ 1244.52 2574.51 156214.2738 666600.4129 322289.4499

A) Give the equation of the least squares regression line. (Round to three decimal places)

B) Compute the sample mean and standard deviation for the Average Daily Sales variable (Round to two decimal places)

C) Find and interpret the value of r². (Round to three decimal places)

D) If the fruit stand spends $129 on advertising in one month, what is the expected average daily sales for that month? (Round to two decimal places)

Math   Statistics-And-Probability   
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