Confidence Intervals and Statistical Significance Quiz

• 95% accuracy of the estimate proportion
• 95% probability that the true proportion is in the confidence interval (correct)
• 95% chance that the estimate proportion falls within the interval if an experiment is repeated
• 95% of the sample data falls within the confidence interval

• The mean is always greater than the median
• The median is more affected by outliers than the mean
• The mean represents that half the samples are under the value and the other half over it
• The mean and the median have always the same value (correct)

• The Gaussian distribution is an idealisation of a random process and data must necessarily look Gaussian (correct)
• The Gaussian distribution is always perfectly symmetrical
• If the p-value is high in a normality test, the observed data is not incompatible with a Gaussian distribution
• Normality tests allow us to quantify if the data contradicts the Gaussian assumption