Suppose a Certain Species Bird Has an Average Weight of Grams

question 5

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. Find the sample size necessary for a 95% confidence level with a maximal error of estimate for the mean weights of the hummingbirds. $$\bar { x } = 3.60$$ $$\sigma = 0.36$$ $$E = 0.18$$

• A)61
• B)31
• C)4
• D)16
• E)8

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