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Home Q & A Board Science-Related Homework Help Mathematics Statistics and Probability
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sunkiss22 sunkiss22
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4 months ago
Use the following to answer the questions below:

"Black Friday," which occurs annually the day after Thanksgiving, is one of the biggest shopping days of the year. During the holiday season, many stores created controversy by starting their mega-sales on Thanksgiving itself. In a random sample of 25 individuals who shopped during the Black Friday four-day weekend (Thursday - Sunday), the average amount spent was $399.40 with standard deviation $171.10. The data are displayed in the provided dotplot.

A dotplot depicts the results of the amount spent during the Black Friday weekend for 25 individuals. The horizontal axis is labeled, Amount spent and has markings from 90 to 720 in increments of 90. The dots are plotted as follows: 1 dot above 70, 130, 140, 210, 250, 260, 270, 300, and 310; 2 dots above 360; and 1 dot above 380, 390, 450, 460, 470, 480, 500, 520, 530, 550, 560, 570, 700, and 750. There are no dots above 90, 180, 630 and 720. All values are approximate.

Would the 95% confidence interval provide evidence that the average amount spent over the 2011 Black Friday weekend differs from the average amount spent over the 2012 Black Friday weekend?

▸ No

▸ Yes
Textbook 
Statistics: Unlocking the Power of Data

Statistics: Unlocking the Power of Data


Edition: 3rd
Authors:
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maoginmaogin
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4 months ago
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sunkiss22 Author
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4 months ago
Thanks
ofsuahasiufhoas
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Yesterday
Good timing, thanks!
veronee_madison
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2 hours ago
Thanks for your help!!
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