Answer:
Step-by-step explanation:
The formula for the standard error of the difference between the estimates od the population proportions is:
This is expected, as the variance of a sum (or a substraction) of two random variables is equal to the sum of the variance of the two variables.
Then, the standard error (or standard deviation) is the square root of this variance.
Answer:
D. temperature(minutes), or t(m)
Step-by-step explanation:
Based on the information given, only the temperature of the coffee and the amount of minutes it sits is involved. This means we can eliminate choices "A," and "B."
When something depends on another, it's outside of the parenthesis. So in this case, the temperature depends on the amount of minutes it sits on the desk, making the temperature outside of the parenthesis.
Using proportions, it is found that it took 15 days for the students to finish the project.
<h3>What is a proportion?</h3>
A proportion is a fraction of a total amount, and the measures are related using a rule of three. Due to this, relations between variables, either direct or inverse proportional, can be built to find the desired measures in the problem.
In this problem, we have that:
- 100% of the project is done by 5 students in 15 days.
- After the 3 students left, 2 students will have a time of x days to do 100 - (9/15) = 40% of the project.
The compound <em>rule of three</em> is given as follows:
1 project - 5 students - 15 days
0.4 project - 2 students - x days
Increasing the number of students, the number of days is reduced, hence the measures are inverse proportional and the <em>rule of three</em> is given by:
15/x = 1
x = 15 days.
It took 15 days for the students to finish the project.
More can be learned about proportions at brainly.com/question/24372153
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