Suppose a Certain Species Bird Has an Average Weight of Grams

question 2

Multiple Choice

Suppose a certain species bird has an average weight of grams. Based on previous studies, we can assume that the weights of these birds have a normal distribution with grams. For a small group of 12 birds, find the margin of error for an 80% confidence interval for the average weights of these birds. $$\bar { x } = 3.45$$ $$\sigma = 0.34$$

• A)0.22 grams
• B)0.13 grams
• C)0.02 grams
• D)0.44 grams
• E)0.06 grams

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