Answer:
The 99% confidence interval for the fraction of U.S. adult Twitter users who get some news on Twitter is between 49.34% and 60.66%, which means that we are 99% sure that the true percentage of US adult Twitter users who get some news is in this interval.
Step-by-step explanation:
Confidence interval:
A confidence interval has the following format:
In which M is the sample mean, z is related to the confidence level and s is the standard error.
55% of U.S. adult Twitter users get at least some news on Twitter (Pew, 2013). The standard error for this estimate was 2.2%.
This means that
99% confidence level
So , z is the value of Z that has a pvalue of , so .
Lower bound of the interval:
Upper bound:
The 99% confidence interval for the fraction of U.S. adult Twitter users who get some news on Twitter is between 49.34% and 60.66%, which means that we are 99% sure that the true percentage of US adult Twitter users who get some news is in this interval.
Answer:
Step 1: We make the assumption that 850 is 100% since it is our output value.
Step 2: We next represent the value we seek with $x$x.
Step 3: From step 1, it follows that $100\%=850$100%=850.
Step 4: In the same vein, $x\%=153$x%=153.
Step 5: This gives us a pair of simple equations:
$100\%=850(1)$100%=850(1).
$x\%=153(2)$x%=153(2).
Step 6: By simply dividing equation 1 by equation 2 and taking note of the fact that both the LHS
(left hand side) of both equations have the same unit (%); we have
$\frac{100\%}{x\%}=\frac{850}{153}$
100%
x%=
850
153
Step 7: Taking the inverse (or reciprocal) of both sides yields
$\frac{x\%}{100\%}=\frac{153}{850}$
x%
100%=
153
850
$\Rightarrow x=18\%$⇒x=18%
Therefore, $153$153 is $18\%$18% of $850$850.
Step-by-step explanation:
Got this off of the web ages ago i got a question like this and this is what i wrote
An obtuse triangle would be formed. If you add all the angles, you get a total of more then 180 causing it to b obtuse.
Answer:
24
Step-by-step explanation:
Divide 40 by 10 and multiply your answer by 6
Line AE is NOT parallel to line BD. This is because the intercepts made by the lines and the transversals are not proportional
<h3>Parallel lines theorem</h3>
In the given diagram,
If
Then,
Line AE is parallel to line BD
From the given information,
|AB| = x = 9
|ED| = 5
|AC| = 9 + 11 = 20
|EC| =5 + 7 = 12
Thus,
20 × 5 = 9 × 12
100 ≠ 108
∴ The lines are not parallel
Hence, line AE is NOT parallel to line BD. This is because the intercepts made by the lines and the transversals are not proportional
Learn more on Parallel lines theorem here: brainly.com/question/3264266
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