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You are studying the measurement of a new biomarker for cardiovascular disease, and how it might be applied to general practice. You assume that the data for this particular biomarker are likely to be normally distributed.

When considering the normal distribution, which of the following is true?

A.95% of observations lie within the mean and 1 standard deviation
B.Data need to be transformed before they can be analysed with parametric tests
C.Data with a tail of values which is greater than the upper end of the distribution are normally distributed
D.The mean, median and mode are the same value
E.The 95% confidence interval tells us how confident we are in the test

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