Please show your work When a poultry farmer uses her regular

Please show your work.

When a poultry farmer uses her regular feed, the newborn chickens have normally distributed weights with a mean of 62.2 oz. In an experiment with an enriched feed mixture, nine chickens are born with the weights (in ounces) given below. Use a 0.001 significance level to test the claim that the mean weight is higher with the enriched feed.

61.4 62.2 66.9 63.3 66.2 66.0 63.1 63.7 66.6