Can someone check if I this is right?
1 answer:
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Answer:
92% Confidence interval: (0.7078,0.7722)
Step-by-step explanation:
We are given the following in the question:
Sample size, n = 500
Number of travelers who favor tight security, x = 370
92% Confidence interval:
Putting the values, we get:
Answer:
--- sample variance
--- sample standard deviation
Step-by-step explanation:
Given
Required
Calculate the sample variance and sample standard deviation
First, we calculate the midpoint of each class:
The midpoints are calculated by taking the average of the class intervals.
For instance:
Class 116.1 to 120.0 has a midpoint of
The same approach is applied to other classes.
Next, is to calculate the mean:
In this case, it is:
Where
So, we have:
The sample variance (s^2) is:
This gives:
The sample standard deviation (s) is: