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. Does this sample support the original claim? The null hypothesis is:
A) $\mu$ = 6.6
B) $\mu$ $\neq$ 6.6
C) $\mu$ $\ge$ 6.6
D) $\mu$ 7.6
E) $\mu$ $\neq$ 7.6

Question

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. Does this sample support the original claim? The null hypothesis is:
A) $\mu$ = 6.6
B) $\mu$ $\neq$ 6.6
C) $\mu$ $\ge$ 6.6
D) $\mu$ > 7.6
E) $\mu$ $\neq$ 7.6

Quizplus · Accepted Answer

The null hypothesis always states that there is no effect or no difference, and it often reflects a statement of equality. In this case, the null hypothesis would state that the mean weight of newborn infants at the community hospital is equal to 6.6 pounds, which corresponds to choice A, despite the formatting issues in the options.

The Mean Weight of Newborn Infants at a Community Hospital μ\muμ

The Mean Weight of Newborn Infants at a Community Hospital $\mu$