Answer: It supplies water to nearby communities. It is a migration route for many forms of wildlife. It serves as a sewage system for nearby communities. It flows through the United States to the Gulf of Mexico.
Step-by-step explanation:
I can’t see the questions clearly. Could you retake the picture again?
It would be 9 ones or 4 hundred thousands
Answer:
The 98% confidence interval for the mean number of car accidents per month at a specific intersection is between 18.58 and 65.42 accidents per month.
Step-by-step explanation:
We have the standard deviation for the sample, so we use the t-distribution to solve this question.
The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So
df = 16 - 1 = 15
98% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 15 degrees of freedom(y-axis) and a confidence level of . So we have T = 2.602
The margin of error is:
M = T*s = 2.602*9 = 23.42
In which s is the standard deviation of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 42 - 23.42 = 18.58 accidents per month.
The upper end of the interval is the sample mean added to M. So it is 42 + 23.42 = 65.42 accidents per month.
The 98% confidence interval for the mean number of car accidents per month at a specific intersection is between 18.58 and 65.42 accidents per month.