Question 20 (3 points) 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 decision for a statistical significant change in average weights at birth at the 5% level of significance? OFail to reject the null hypothesis. O Reject the null hypothesis and conclude the mean is higher than 6.6 pounds. O Reject the null hypothesis and conclude the mean is lower than 6.6 pounds. Cannot calculate because the population standard deviation is unknown