In: Math
The City of Charlotte is experiencing flooding. The City has determined that it will activate the flood
gates when the average flood level reaches 2 feet. The flood control system is activated and
resources are directed to flood control when the flood condition is equal to or more than the 2 feet
standard the City has set. The City sampled 20 spots in the urban area between 7:00am and 8:00am.
This data set will be posted to Canvas. Examine the data using the concepts you have learned in
Chapter 10. Should the City activate the flood control system? Why or why not?
Data Set:
Areas. Feet of Flood Water
1 0
2 3
3 1
4 2
5 0
6 0
7 2
8 3
9 1
10 3
11 2
12 2
13 5
14 1
15 2
16 0
17 2
18 1
19 0
20 2
H0: Null Hypothesis: 2 (Flood
condition is equal to or more than the 2 feet standard the City has
set)
HA: Alternative Hypothesis: 2 (Flood
condition is not equal to or more than the 2 feet standard the City
has set)
From the given data, the following statistics are calculated:
n = 20
= 1.6
s = 1.3139
SE = s/
= 0.2938
Test statistic is given by:
t = (1.6 - 2)/0.2938
= - 1.3615
Take = 0.05
ndf = n - 1 = 20 - 1 = 19
One Tail - Left Side Test
From Table, critical value of t = - 1.9271
Since calculated value of t = - 1.3615 is greater than critical value of t =- 1.9271, the difference is not significant. Fail to reject null hypothesis.
Conclusion:
The data support the claim that flood condition is equal to or more
than the 2 feet standard the City has set. So, the City should
activate the flood control system.