Kareen correctly answered 85% of the questions on his math test. If he answered 34
1 answer:
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Answer and Explanation: The answer and explanation is in the image.
Answer:
The confidence interval is , in which n is the size of the sample.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Z-table as such z has a p-value of .
That is z with a pvalue of , so Z = 1.96.
Now, find the margin of error M as such
In which is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is
The upper end of the interval is the sample mean added to M. So it is
The confidence interval is , in which n is the size of the sample.
Hope this helps you understand
