A random sample has been selected from a population. The point estimate = 78.65 and margin of error E = 8.24 for a 90% confidenc e level have been calculated for you. Construct the confidence interval that corresponds to this information.
1 answer:
Answer:
90% confidence interval: (70.41,86.89)
Step-by-step explanation:
We are given the following in the question:
Point estimate = 78.65
Margin of error, E = 8.24
Confidence level = 90%
Significance level = 10%
Formula:
Putting the values , we get,
(70.41,86.89) is the required 90% confidence interval.
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