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?
What is the decision for a statistical signiﬁcant change in average weights at birth at the 5% level of
Signiﬁcance?
A) Fail to reject the null hypothesis and conclude the mean is 6.6 lb.
B) Reject the null hypothesis and conclude the mean is higher than 6.6 lb.
C) Reject the null hypothesis and conclude the mean is lower than 6.6 lb.
D) Cannot calculate because population standard deviation is unknown.

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?
What is the decision for a statistical signiﬁcant change in average weights at birth at the 5% level of
Signiﬁcance? 
A) Fail to reject the null hypothesis and conclude the mean is 6.6 lb. 
B) Reject the null hypothesis and conclude the mean is higher than 6.6 lb. 
C) Reject the null hypothesis and conclude the mean is lower than 6.6 lb. 
D) Cannot calculate because population standard deviation is unknown.

Quizplus · Accepted Answer

Fail to reject the null hypothesis and conclude the mean is 6.6 lb.

The Mean Weight of Newborn Infants at a Community Hospital