Do those little peanut bags handed out during airline flights actually contain as many peanuts as they claim? From a box of peanut bags that have 14g label weights, fifteen bags are sampled and...

Do those little peanut bags handed out during airline flights actually contain as many peanuts as they claim? From a box of peanut bags that have 14g label weights, fifteen bags are sampled and weighed: 16.4. 14.4, 15.5, 14.7. 15.6, 15.2, 15.2, 15.2, 15.3. 15.4, 14.6, 15.6, 14.7. 15.9, 13.9. Are the data approximately normal so that a t-test has validity?