4. If a random sample of 50 cups of soda dispensed from a machine showed the mean amount of soda dispensed was 7.9 ounces with s=0.35 ounces, find the confidence level if the margin of error is 0.083.
5. Suppose that a random sample of 25 mining caps was tested from a population of 300 mining caps and 20 exploded properly.
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