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There may be more than one correct statement, Check all that are true In interval estimation of the population mean, the fundamental difference between the

There may be more than one correct statement, Check all that are true

  1. In interval estimation of the population mean, the fundamental difference between the t and z procedures is that we us et for small sample sizes and z for large sample sizes
  2. On average , the sample mean equals the population mean
  3. All else being equal , a 99% confidence interval for mu will be wider than the corresponding 95% interval.
  4. If the sample size is small , the sampling distribution of the sample mean cannot be normal

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