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In a sample of 40 US adults, the mean systolic blood pressure was 127.3 mmHg. Assume...

In a sample of 40 US adults, the mean systolic blood pressure was 127.3 mmHg. Assume that the standard deviation for the systolic blood pressure of all US adults is 20 mmHg.
1. Find a 90% confidence interval for the mean systolic blood pressure for all US adults.
2. interpret the confidence interval you found in problem 1.
3. how large of a sample would you need so that the margin of error in a 90% confidence interval is at most 3?

need answers to all 3 questions please!!

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orchestra answered 2 years ago
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