For each statement, express the null hypothesis ?0H0 and alternative hypothesis ?1H1 in symbolic form. 1. IQ scores of statistics students have a standard deviation at least 15. A. ?0:?≤15,H0:σ≤15, ?1:?>15H1:σ>15 B. ?0:?<15,H0:μ<15, ?1:?≥15H1:μ≥15 C. ?0:?≥15,H0:σ≥15, ?1:?<15H1:σ<15 D. ?0:?≤15,H0:μ≤15, ?1:?>15H1:μ>
For each statement, express the null hypothesis ?0H0 and alternative hypothesis ?1H1 in symbolic form.
1. IQ scores of statistics students have a standard deviation at least 15.
A. ?0:?≤15,H0:σ≤15, ?1:?>15H1:σ>15
B. ?0:?<15,H0:μ<15, ?1:?≥15H1:μ≥15
C. ?0:?≥15,H0:σ≥15, ?1:?<15H1:σ<15
D. ?0:?≤15,H0:μ≤15, ?1:?>15H1:μ>15
2. The mean salary of statistics professors is less than 70,000 dollars.
A. ?0:?≥70,000,H0:μ≥70,000, ?1:?<70,000H1:μ<70,000
B. ?0:?>70,000,H0:μ>70,000, ?1:?≤70,000H1:μ≤70,000
C. ?0:?<70,000,H0:μ<70,000, ?1:?≥70,000H1:μ≥70,000
D. ?0:?≤70,000,H0:μ≤70,000, ?1:?>70,000H1:μ>70,000
3. At most one-half of all Internet users make on-line purchases.
A. ?0:?≥0.5,H0:p≥0.5, ?1:?<0.5H1:p<0.5
B. ?0:?≥0.5,H0:μ≥0.5, ?1:?<0.5H1:μ<0.5
C. ?0:?≤0.5,H0:p≤0.5, ?1:?>0.5H1:p>0.5
D. ?0:?≤0.5,H0:μ≤0.5, ?1:?>0.5H1:μ>0.5
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