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

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 $\mu_\mathrm{H}-\mu_\mathrm{p}$ 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 $90 \%$ CI for $\mu_\mathrm{H}-\mu_\mathrm{p}$ . (Notice that the order of subtraction has changed here.)

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If you were to instead to calc...

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