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Random Samples of Monthly Rent Prices, in Dollars, for Studio μH−μp\mu_\mathrm{H}-\mu_\mathrm{p}

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Random samples of monthly rent prices, in dollars, for studio and one-bedroom apartments, were obtained for the Pennsylvania cities of Harrisburg and Philadelphia in July 2007. A 90% confidence interval for the difference in population means μH−μp\mu_\mathrm{H}-\mu_\mathrm{p} turns out to be (-$261.1, -$22.3).
-Comment on how the interval would change (both its midpoint and half-width) if you were instead to calculate a 99%99 \% CI for μH−μp\mu_\mathrm{H}-\mu_\mathrm{p} .

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