The 99% confidence interval for the mean, calculated from a sample is 2.05944 ? ? ? 3.94056. Determine the sample mean ?X = . Assuming that the data is normally distributed with the population standard deviation =2, determine the size of the sample n =
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We know that the 99% confidence interval for the mean is given by the formula: $$\bar{X} \pm Z \frac{\sigma}{\sqrt{n}}$$ where $\bar{X}$ is the sample mean, $Z$ is the Z-score corresponding to the 99% confidence level, $\sigma$ is the population standard Show more…
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