TABLE 8-1
A random sample of 100 stores from a large chain of 500 garden supply stores was selected to determine the mean number of lawnmowers sold at an end-of-season clearance sale. The sample results indicated a mean of 6 and a standard deviation of 2 lawnmowers sold. A 95% confidence interval (5.623 to 6.377) was established based on these results.
-Referring to Table 8-1, we do not know for sure whether the true population mean is between 5.623 and 6.377 lawnmowers sold.

Question

Quizplus · Accepted Answer

A confidence interval provides an estimate of the range in which the true population mean is likely to lie. However, there is still a possibility that the true mean may not be within the interval, although this likelihood is usually small. Therefore, we cannot be completely sure whether the true population mean is between 5.623 and 6.377 or not, and the answer is true.

TABLE 8-1 A Random Sample of 100 Stores from a Large Chain