Question: A confidence interval estimate for a single proportion, based on a random sample of 500 is 0.372 to 0.428. From this information, what level of

A confidence interval estimate for a single proportion, based on a random sample of 500 is 0.372 to 0.428. From this information, what level of confidence level was used in this estimate?(Hint: Work backwards from the margin of error to find the critical value.)

approximately 90%
Approximately 80%
Approximately 99%
Approximately 95%
It cannot be determined with the information given.

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