IMathAS-libretexts

1. In a recent survey of 340 American young people, 272 of them reported having completed high school. Use technology to determine the margin of error for a 95% confidence interval for the corresponding population proportion. (Please round all proportions to three decimal places. Do not convert to a percentage.)

2. Using the the same numbers x = 272 and n = 340, use technology to determine the margin of error for a 99% confidence interval. (Please round all proportions to three decimal places. Do not convert to a percentage.)

3. Which one of the following statements is true?

When the confidence level is higher, the standard error is larger.
When the confidence level is higher, the standard error is smaller.
Confidence level does not affect margin of error.
When the confidence level is higher, the confidence interval is more narrow.
When the confidence level is higher, the confidence interval is wider.

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