The Mountain View ski resort kept track of the number of visitors they had each weekend during their busy season. This box plot
shows the results.
Ski resort visitors
0
2,000
4,000
6,000
8,000
10,000
What percent of the time did Mountain View get at least 4,000 visitors?
Ski resort visitors
0
2,000
4,000
6,000
8,000
10,000
What percent of the time did Mountain View get at least 4,000 visitors?
2 answers:
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Answer:
The 95% confidence interval for the fraction of all shoppers during the year whose visit was because of a coupon they'd received in the mail is (0.2016, 0.2694).
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of
, we have the following confidence interval of proportions.
In which
z is the z-score that has a p-value of .
A store randomly samples 603 shoppers over the course of a year and finds that 142 of them made their visit because of a coupon they'd received in the mail.
This means that
95% confidence level
So , z is the value of Z that has a p-value of
, so
.
The lower limit of this interval is:
The upper limit of this interval is:
The 95% confidence interval for the fraction of all shoppers during the year whose visit was because of a coupon they'd received in the mail is (0.2016, 0.2694).