Is it possible or not possible to draw a triangle with sides lengths of 4, 5 and 7?
2 answers:
You might be interested in
Answer:
5 and 1/3 cups of water.
Step-by-step explanation:
Set up a proportion like this:
2:3 for the original recipe
Then a second proportion for the recipe Jacoby used:
w:8 (use w for the unknown water amount)
Set up an equation so that the proportions equal each other. It helps if you write them in fraction form:
Use cross multiplication to get the new equation:
8 x 2 (or 16) = 3w
Then, divide both sides by 3 to get the amount for w, or water, by itself:
5 and 1/3 = w
I hope this helps! ☺
Answer:
c.A 90% confidence level and a sample size of 300 subjects.
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
, we have the confidence interval with a margin of error of:
In which
z is the zscore that has a pvalue of .
In this problem
The proportions are the same for all the options, so we are going to write our margins of error as functions of
So
a.A 99% confidence level and a sample size of 50 subjects.
99% confidence interval
So , z is the value of Z that has a pvalue of
, so
.
The margin of error is
b.A 90% confidence level and a sample size of 50 subjects.
90% confidence interval
So , z is the value of Z that has a pvalue of
, so
.
The margin of error is
c.A 90% confidence level and a sample size of 300 subjects.
90% confidence interval
So , z is the value of Z that has a pvalue of
, so
.
The margin of error is
This produces smallest margin of error.
d.A 99% confidence level and a sample size of 300 subjects.
99% confidence interval
So , z is the value of Z that has a pvalue of
, so
.
The margin of error is