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Testing the Mean Life of a Battery

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1) Which of the following would be the correct hypotheses for testing the claim that the mean life of a battery for a cellular phone (while the phone is left on) is less than 24 hours?
A. H0: &#61549; &#61619; 24 and Ha: &#61549; < 24
B. H0: &#61549; = 24 and Ha: &#61549; &#61625; 24
C. H0: &#61549; &#61603; 24 vs. Ha: &#61549; > 24
D. H0: &#61549; > 24 vs. Ha: &#61549; &#61619; 24

2) Which of the following would be the alternative hypothesis in testing the claim that the mean distance students commute to campus is no more than 8.2 miles?
A. Ha: &#61549; &#61625; 8.2
B. Ha: &#61549; > 8.2
C. Ha: &#61549; < 8.2
D. Ha: &#61549; &#61603; 8.2

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