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Home Q & A Board Science-Related Homework Help Mathematics Statistics and Probability
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danyyzz danyyzz
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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.

A natural question would be if more money was spent over the Black Friday weekend than over the previous year's Black Friday weekend (which did not start on Thursday). What information would be necessary to address this question using the paired data difference in means method? How could the data be collected so that the difference in means for two separate groups method would be most appropriate?
Textbook 
Statistics: Unlocking the Power of Data

Statistics: Unlocking the Power of Data


Edition: 3rd
Authors:
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jaimielaviejaimielavie
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4 months ago
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danyyzz Author
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4 months ago
You make an excellent tutor!
fxinternational
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Yesterday
Thanks for your help!!
sakoon
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2 hours ago
Smart ... Thanks!
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