Answer:
6%
Step-by-step explanation:
60 = 500•2•rate
60 = 1000•rate
rate = 60/1000
rate = 0.06 = 6%
Answer:
add them up
Step-by-step explanation:
Here is a real answer
I think -5 my apologies if I’m wrong :)
Answer:
And the z score for 0.4 is
And then the probability desired would be:
Step-by-step explanation:
The normal approximation for this case is satisfied since the value for p is near to 0.5 and the sample size is large enough, and we have:
For this case we can assume that the population proportion have the following distribution
Where:
And we want to find this probability:
And we can use the z score formula given by:
And the z score for 0.4 is
And then the probability desired would be:
Answer:
The width of the confidence interval decreases.
Step-by-step explanation:
In a normal distribution, if the confidence level is decreased while the sample size remains the same, the confidence interval for the population mean narrows. Since the certainty required is lower, the interval can be narrowed towards a central point, which is the calculated sample mean.
Therefore, the width of the confidence interval decreases.