A hypothesis regarding the weight of newborn infants at a community hospital is that the mean is 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 mean?
A)6.6
B)7.6
C)1.177
D)2.447

Question

Quizplus · Accepted Answer

To find the sample mean, we sum up all the weights and divide by the total number of infants in the sample.
(9.0 + 7.3 + 6.0 + 8.8 + 6.8 + 8.4 + 6.6) / 7 = 7.6
Therefore, the sample mean is 7.6, which is greater than the hypothesized mean of 6.6 pounds.

A Hypothesis Regarding the Weight of Newborn Infants at a Community