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7.59 Pat wonders if two-bedroom apartments rent for significantly morę than one-bedroom apartments. Use the data in the previous exercise to find out.
(a) State appropriate nuli and altemative hypotheses.
(b) Report the test statistic, its degrees of freedom, and the P-value. What do you conclude?
(c) Can you conclude that every one-bedroom apartment costs less than every two-bedroom apartment?
(d) In the previous exercise you found a confidence interval. In this exercise you performed a significance test. Which do you think is morę useful to someone planning to rent an apartment? Why?
7.60 Does bread lose its vitamins when stored? Smali loaves of bread were prepared with flour that was fortified with a fixed amount of vitamins. After baking, the vitamin C content of two loaves was measured. Another two loaves were baked at the same time, stored for three days, and then the vitamin C content was measured. The units are milligrams per hundred grams of flour (mg/100 g).23 Here are the data:
Immediately after baking: 47.62, 49.79
Three days after baking: 21.25, 22.34
(a) When bread is stored, does it lose vitamin C? To answer this ąuestion, ,
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