The statement is false, the true statement is "the mean voltage will be contained in the 99% confidence interval calculated from these data."
Given,
sample=11.77, 11.90, 11.64, 11.84, 12.13, 11.99, 11.77
A 99% confidence interval gives you more assurance that the interval represents the true value in the population. It does, however, provide a wider interval than a 95% confidence interval. For most analyses, a 95% confidence interval is sufficient to extend your results to the general population.
These intervals are simply a way of providing a range of values that we are reasonably confident (either 95% or 99%) includes the true population mean. A 99% confidence interval gives you more assurance that the interval represents the true value in the population.
As a result, the 99% confidence interval calculated from these data will include the mean voltage for the entire set of data.
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