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jeanlucceltrick09
05.05.2020 •
Mathematics
If a survey of a movie shows that 50% of all people who like the movie, enjoyed the official movie soundtrack too. If a total of 3850 people were asked, find the data of the survey. What is the sample size? If the margin of error for this survey is 1.6%, what is the 95% confidence interval using only 1 decimal?
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Ответ:
For the first question the sample size is n= 3850
And replacing we got:
We are confident at 95% that the true proportion of all people who like the movie is between 0.484 and 0.516.
Step-by-step explanation:
We have the following info given:
For the first question the sample size is n= 3850
For the second part they gives to us the margin of error:
We know that the confidence interval for a population proportion
of interest is given by:
And the margin of error is given by:
So then the confidence interval can be found with this formula:
And replacing we got:
We are confident at 95% that the true proportion of all people who like the movie is between 0.484 and 0.516.
Ответ:
The graph that you see below is C. f(x)= |x+8|
To find this, we first know we need a positive front number. We know this since the graph points up. As a result, we know the answer is either C or D.
Now to determine which is correct, use the point (-8, 0) represented on the graph to see if it belongs on the graphs for C or D. Whichever it works for is the correct answer. Below is the work for C.
f(x)= |x+8|
0= |-8+8|
0= |0|
0 = 0 TRUE
Therefore c is the correct answer