A sample of 20 heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce was then recorded. The mean weight was 2.2 pounds with a standard deviation of 0.1 pounds. The population standard deviation is known to be 0.2 pounds. In complete sentences, give an interpretation of what the 95% confidence interval for the population mean weight of the heads of lettuce means. There is a 95% chance that the weight of a head of lettuce lies within this interval. We are 95% confident that the true population mean weight of all weights of heads of lettuce lies within this interval. We are 95% confident that the weight of a head of lettuce lies within this interval. We are 95% confident that the mean weight of the sample of 20 heads of lettuce lies within this interval.