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Confidence Intervals

The table gives the average low tempatures in January and July for twelve cities.
Construct a 99% confidence interval for the mean temperature difference (January-July)
between winter and summer. Assume the population are normally distributed.

Cities
JANUARY
JULY

Chhose the 99% confidence interval for the mean difference )January-July) in the average low temperature.

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This solution looks at a 99% confidence interval of mean difference in temperatures.

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