TABLE 8-4
The actual voltages of power packs labeled as 12 volts are as follows: 11.77, 11.90, 11.64, 11.84, 12.13, 11.99, and 11.77.
-Referring to Table 8-4, a confidence interval estimate of the population mean would only be valid if the distribution of voltages is normal.

Question

Quizplus · Accepted Answer

In order to use a confidence interval estimate of the population mean, the distribution of the sample must be approximately normal. If the sample is not normally distributed, other statistical methods should be used.

TABLE 8-4 The Actual Voltages of Power Packs Labeled as 12 Volts