The mean weight of newborn infants at a community hospital is said to be 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. What is the sample standard deviation?
A) 1.177
B) 6.6
C) 1.385
D) 7.6

Question

Quizplus · Accepted Answer

The sample standard deviation is calculated using the formula for standard deviation of a sample. The given weights are used to find the mean, and then the deviations from the mean are squared, summed, divided by n-1 (degrees of freedom), and the square root is taken to find the standard deviation, which is approximately 1.177.

The Mean Weight of Newborn Infants at a Community Hospital