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Which of the following statements is true? The 95% confidence interval is wider than the 99%...

  1. Which of the following statements is true?
  1. The 95% confidence interval is wider than the 99% confidence interval.
  2. The ONLY way to reduce the width of a confidence interval is to reduce the confidence level.
  3. The required sample size for a population mean is ONLY dependent on population variance.
  4. Given population variance and sampling error, higher confidence level results in larger sample size.
Math   Statistics-And-Probability   
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