Top Posters
Since Sunday
p
4
h
4
c
4
d
3
3
c
3
t
3
u
3
A
3
B
3
j
3
s
3

# Use the following to answer the questions below:"Black Friday," which occurs annually the day ...

wrote...
Posts: 144
Rep:
2 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.

Suppose we know that in a random sample of n = 22 individuals who shopped over Black Friday weekend in 2011 the average amount spent was $381.30 with standard deviation$119.80. Construct a 95% confidence interval for the difference in the mean amount spent between the 2012 and 2011 Black Friday weekends. Round the margin of error to two decimal places.

Recall that for the 2012 sample of 25 individuals, the average amount spent was $399.40 with standard deviation$171.10. Dotplots of both samples are provided.

▸ -$76.07 to$112.27

▸ -$91.86 to$128.06

▸ -$65.59 to$101.79

▸ -$70.72 to$106.92
Textbook

## Statistics: Unlocking the Power of Data

Edition: 3rd
Authors:
Replies
Answer verified by a subject expert
ecunis1ecunis1
wrote...
Posts: 146
Rep:
2 months ago

### Related Topics

renielle Author
wrote...

2 months ago
 Correct TY
wrote...

Yesterday
 Thanks
wrote...

2 hours ago
 This helped my grade so much