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1. The Food and Drug Administration (FDA) needs to estimate the average content of an additive in a given food product. A random sample of 75 portions of the product gives x = 8.9 units and s = 0.5 unit. Give a 95% con?dence interval for the average number of units of additive in any portion of this food product.

2. The management of a supermarket needs to make estimates of the average daily demand for milk. The following data are available (number of half-gallon con- tainers sold per day): 48, 59, 45, 62, 50, 68, 57, 80, 65, 58, 79, 69. Assuming that this is a random sample of daily demand, give a 90% con?dence interval for average daily demand for milk.

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