This problem can be solved using dimensional analysis.
What is the slope of the line between (3,-4) and (-2, 1)? (1 point)
2 answers:
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Answer:
a)
b) n = 381
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 of
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
The margin of error is:
90% confidence level
So , z is the value of Z that has a pvalue of
, so
.
a. Assume that nothing is known about the percentage of computers with new operating systems. n = ?
When we do not know the proportion, we use , which is when we are going to need the largest sample size.
The sample size is n when M = 0.01.
b. Assume that a recent survey suggests that 99% of computers use a new operating system. n = ?
Now we have that . So
Rouding up
n = 381
Answer: 23.9
Step-by-step explanation:
1. First, you must calculate the mean, as following:
2. Now, you should substract the means obtained to every single number of the set and then square it. Add all of them:
3. The mean of this is:
4. The square root of this result is:
5. To the nearest tenth, the result is: 23.9