The mean weight of newborn infants at a hospital is 2.9 kg. A sample of seven infants is randomly selected and their weights at birth are recorded with a mean weight 3.2 kg and a standard deviation 0.58 kg. We want to investigate if there is a statistically significant increase in average weights at birth at the 1% level of significance.
state the null and alternative hypotheses. Write down the conditions for selecting a suitable test statistic. Write down the critical value. If the test is calculated to be 1.37, what is the decision for a statistically significant increase in average weights at birth?