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21.) You're not sure if your car battery is going to make it through the winter. You test it several times to see what the

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21.) You're not sure if your car battery is going to make it through the winter. You test it several times to see what the voltage is. After testing it 14 times you find the mean voltage is 87 with a standard deviation of 9. Find a 90% confidence interval for the true average voltage in the battery

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