Answer:
The lower bound of the 80% confidence interval of the average typing speed of a student of this college is of 68.516 words per minute.
Step-by-step explanation:
We have the standard deviation for the sample, which means that the t-interval is used 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 = 20 - 1 = 19
80% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 19 degrees of freedom(y-axis) and a confidence level of . So we have T = 1.328
The margin of error is:
In which s is the standard deviation of the sample and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 70 - 1.484 = 68.516 wpm.
The lower bound of the 80% confidence interval of the average typing speed of a student of this college is of 68.516 words per minute.
Answer:
what
Step-by-step explanation:
Answer:
(-8,-3)
(-4,-1)
(0,1)
(2,2)
(6,4)
Step-by-step explanation:
One by one, substitue the x values and solve for y
$25 + $35x = $200
$35x = $175 (subtracted the 25)
x = 5 hours (divided the 35)
So you could rent the boat for 5 hours.
Answer:
d∥e
Step-by-step explanation:
The figure shows that line e is perpendicular to line b, and line d is perpendicular to line b.
Theorem: If two lines are perpendicular to the same line, then the lines are parallel.
Since lines d and e are perpendicular to the same line, b, then lines d and e are parallel.
Answer: d∥e