The Mean Weight of Newborn Infants at a Community Hospital

question 50

Multiple Choice

The mean weight of newborn infants at a community hospital 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 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.