Making Inferences from a Random Sample

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Making Inferences from Random Samples

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Presentation transcript:

Making Inferences from a Random Sample

Warm Up Paul and his friends average their test grades and find that the average is 95. The teacher announces that the average grade of all of her classes is 83. Why are the averages so different? Nancy hears a report that the average price of gasoline is $2.82. She averages the prices of stations near her home. She finds the average price of gas to be $3.03. Why are the averages different?

How many MP3 players in the shipment would you predict to be damaged if 6 MP3s in the sample had been damaged?